<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman, new york, times, serif;font-size:12pt"><DIV>Thanks Chris. Yes, I meant 2200 volts. I also megged at 3000 volts when I used a megger with fixed 1000, 3000, and 5000 volts settings. From a practical standpoint, 1000 volts will find wet and almost all dry megger test problems.<BR></DIV>
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<B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> Chris Anderson <CAnderson@borregosolar.com><BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> RE-wrenches <re-wrenches@lists.re-wrenches.org><BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Thursday, September 17, 2009 8:34:46 AM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> Re: [RE-wrenches] Insulation testing<BR></FONT><BR>
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<P class=MsoNormal><SPAN style="COLOR: #1f497d">I believe you mean 2200v?</SPAN></P>
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<P class=MsoNormal><SPAN style="COLOR: #1f497d">I did see this formula in the aforementioned Fluke report, but was cautions about going that high as it seemed unnecessarily higher than the voltages we would ever see in PV and from a pragmatic standpoint, the reasonable priced Meggers seemed to only go up to 1000v.</SPAN></P>
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<P class=MsoNormal><SPAN style="COLOR: #595959">-Chris Anderson</SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #595959; FONT-SIZE: 9pt"> Chief Technology Officer</SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #595959; FONT-SIZE: 9pt"> Resources Group </SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #595959; FONT-SIZE: 9pt"> C: 603-732-2411</SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #595959; FONT-SIZE: 9pt"> Borrego Solar Systems</SPAN></P></DIV>
<P class=MsoNormal><SPAN style="COLOR: #1f497d"> </SPAN></P>
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<P class=MsoNormal><B><SPAN style="FONT-FAMILY: 'Tahoma', 'sans-serif'; FONT-SIZE: 10pt">From:</SPAN></B><SPAN style="FONT-FAMILY: 'Tahoma', 'sans-serif'; FONT-SIZE: 10pt"> re-wrenches-bounces@lists.re-wrenches.org [mailto:re-wrenches-bounces@lists.re-wrenches.org] <B>On Behalf Of </B>Joel Davidson<BR><B>Sent:</B> Wednesday, September 16, 2009 8:43 PM<BR><B>To:</B> RE-wrenches<BR><B>Subject:</B> Re: [RE-wrenches] Insulation testing</SPAN></P></DIV></DIV>
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<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Arial', 'sans-serif'; FONT-SIZE: 10pt">Hello Chris,</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 12pt"></SPAN></P></DIV>
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<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Arial', 'sans-serif'; FONT-SIZE: 10pt">Nicely summarized. Thank you. I megger to the UL 1703 standard for module hi-pot testing is 2X system voltage plus 1000 volts. For example, 600 volts X 2 + 1000 = 1200 volts.</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 12pt"></SPAN></P></DIV>
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<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Arial', 'sans-serif'; FONT-SIZE: 10pt">Best regards,</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 12pt"></SPAN></P></DIV>
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<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Arial', 'sans-serif'; FONT-SIZE: 10pt">Joel Davidson</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 12pt"></SPAN></P></DIV>
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<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Arial', 'sans-serif'; FONT-SIZE: 10pt">----- Original Message ----- </SPAN></P></DIV>
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<P style="BACKGROUND: #e4e4e4" class=MsoNormal><B><SPAN style="FONT-FAMILY: 'Arial', 'sans-serif'; FONT-SIZE: 10pt">From:</SPAN></B><SPAN style="FONT-FAMILY: 'Arial', 'sans-serif'; FONT-SIZE: 10pt"> <A title=CAnderson@borregosolar.com href="mailto:CAnderson@borregosolar.com" rel=nofollow target=_blank ymailto="mailto:CAnderson@borregosolar.com">Chris Anderson</A> </SPAN></P></DIV>
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<P class=MsoNormal><B><SPAN style="FONT-FAMILY: 'Arial', 'sans-serif'; FONT-SIZE: 10pt">To:</SPAN></B><SPAN style="FONT-FAMILY: 'Arial', 'sans-serif'; FONT-SIZE: 10pt"> <A title=re-wrenches@lists.re-wrenches.org href="mailto:re-wrenches@lists.re-wrenches.org" rel=nofollow target=_blank ymailto="mailto:re-wrenches@lists.re-wrenches.org">RE-wrenches</A> </SPAN></P></DIV>
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<P class=MsoNormal><B><SPAN style="FONT-FAMILY: 'Arial', 'sans-serif'; FONT-SIZE: 10pt">Sent:</SPAN></B><SPAN style="FONT-FAMILY: 'Arial', 'sans-serif'; FONT-SIZE: 10pt"> Wednesday, September 16, 2009 11:19 AM</SPAN></P></DIV>
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<P class=MsoNormal><B><SPAN style="FONT-FAMILY: 'Arial', 'sans-serif'; FONT-SIZE: 10pt">Subject:</SPAN></B><SPAN style="FONT-FAMILY: 'Arial', 'sans-serif'; FONT-SIZE: 10pt"> Re: [RE-wrenches] Insulation testing</SPAN></P></DIV>
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<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 12pt"> </SPAN></P></DIV>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">I would like to put forward our commissioning test procedures with regard to voltage and insulation testing for comment and to share if others are trying to tighten up their commissioning procedures. I would love to hear Bill’s feedback and any input others might have into our process and areas where we might be exposed.</SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">Thanks in advance for your comments.</SPAN></P>
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<P style="TEXT-ALIGN: center; VERTICAL-ALIGN: middle" class=MsoNormal align=center><B><U><SPAN style="FONT-SIZE: 12pt">Sequence and Procedures for </SPAN></U></B></P>
<P style="TEXT-ALIGN: center; VERTICAL-ALIGN: middle" class=MsoNormal align=center><B><U><SPAN style="FONT-SIZE: 12pt">Quality Assurance Testing and System Commissioning </SPAN></U></B></P>
<P style="TEXT-ALIGN: center; VERTICAL-ALIGN: middle" class=MsoNormal align=center><U><SPAN style="FONT-SIZE: 10pt"><SPAN style="TEXT-DECORATION: none"> </SPAN></SPAN></U></P>
<P style="MARGIN-LEFT: 9pt; VERTICAL-ALIGN: middle" class=MsoNormal><B><SPAN style="FONT-SIZE: 10pt">Quality Assurance Testing </SPAN></B></P>
<P style="MARGIN-LEFT: 0.75in; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">o</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">Source Circuit Testing - Voltage and continuity to ground of all strings</SPAN></P>
<P style="MARGIN-LEFT: 81pt; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Symbol; FONT-SIZE: 10pt">·</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">Test conditions:</SPAN></P>
<P style="MARGIN-LEFT: 1.5in; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Wingdings; FONT-SIZE: 10pt">§</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">Testing to be done at the combiner boxes</SPAN></P>
<P style="MARGIN-LEFT: 1.5in; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Wingdings; FONT-SIZE: 10pt">§</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">Modules are connected to the home runs</SPAN></P>
<P style="MARGIN-LEFT: 1.5in; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Wingdings; FONT-SIZE: 10pt">§</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">Positives are landed on the fuse block, but fuses are not yet installed in the CB</SPAN></P>
<P style="MARGIN-LEFT: 1.5in; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Wingdings; FONT-SIZE: 10pt">§</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">Negatives are cut to length and labeled but not landed in the CB</SPAN></P>
<P style="MARGIN-LEFT: 1.5in; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Wingdings; FONT-SIZE: 10pt">§</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">Ground is connected in a continuous path to the racking and modules and is landed in the CB</SPAN></P>
<P style="MARGIN-LEFT: 81pt; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Symbol; FONT-SIZE: 10pt">·</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">Test</SPAN></P>
<P style="MARGIN-LEFT: 1.5in; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Wingdings; FONT-SIZE: 10pt">§</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">Check for voltage between each positive and all negatives - record voltages for each strings and confirm no voltage between strings of different numbers, simultaneously verify polarity as recording voltages</SPAN></P>
<P style="MARGIN-LEFT: 1.5in; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Wingdings; FONT-SIZE: 10pt">§</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">Check for voltage between each positive and ground - record voltage (should be 0)</SPAN></P>
<P style="MARGIN-LEFT: 1.5in; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Wingdings; FONT-SIZE: 10pt">§</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">Check for voltage between each negative and ground - record voltage (should be 0)</SPAN></P>
<P style="MARGIN-LEFT: 1.5in; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Wingdings; FONT-SIZE: 10pt">§</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">Complete the first half of the combiner box commissioning worksheet - noting weather, time of day etc.</SPAN></P>
<P style="MARGIN-LEFT: 81pt; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Symbol; FONT-SIZE: 10pt">·</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">After the test is complete</SPAN></P>
<P style="MARGIN-LEFT: 1.5in; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Wingdings; FONT-SIZE: 10pt">§</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">Each negative can be landed on the negative block in the CB</SPAN></P>
<P style="MARGIN-LEFT: 1.5in; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Wingdings; FONT-SIZE: 10pt">§</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">Test continuity of fuses and insert into holders - DO NOT CLOSE</SPAN></P>
<P style="MARGIN-LEFT: 1.5in" class=MsoNormal><SPAN style="FONT-SIZE: 10pt"> </SPAN></P>
<P style="MARGIN-LEFT: 0.75in; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">o</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">Output Circuits - Insulation testing of wires from CB to Inverter and verification of polarity </SPAN></P>
<P style="MARGIN-LEFT: 81pt; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Symbol; FONT-SIZE: 10pt">·</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">Test conditions:</SPAN></P>
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<LI style="VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-SIZE: 10pt">Testing to be done at the inverter</SPAN> <SPAN style="FONT-SIZE: 10pt"></SPAN></LI>
<LI style="VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-SIZE: 10pt">All wires are run in conduit, cut to length, labeled, spliced if applicable and conduit covers are on from combiner through to inverter</SPAN> <SPAN style="FONT-SIZE: 10pt"></SPAN></LI>
<LI style="VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-SIZE: 10pt">Only the ground wires are landed in both the CB and the inverter </SPAN></LI>
<LI style="VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-SIZE: 10pt">The GFDI fuse is removed from the inverter</SPAN> <SPAN style="FONT-SIZE: 10pt"></SPAN></LI>
<LI style="VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-SIZE: 10pt">All conductors are taped off at the opposite end of where the Megohmeter will be attached and are safely isolated to prevent touching of anything and in a safe position to be energized </SPAN></LI></UL></UL></UL>
<P style="MARGIN-LEFT: 81pt; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Symbol; FONT-SIZE: 10pt">·</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">Test</SPAN></P>
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<LI style="VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-SIZE: 10pt">Megger test all wires to ground at 1000Vdc </SPAN></LI>
<LI style="VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-SIZE: 10pt">Megger test all wires that share a conduit at any point in the system to each other at 1000Vdc</SPAN> <SPAN style="FONT-SIZE: 10pt"></SPAN></LI>
<LI style="VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-SIZE: 10pt">record all values and troubleshoot any wires that have a reading under 100 M Ohms corrected for Temp and humidity</SPAN> <SPAN style="FONT-SIZE: 10pt"></SPAN></LI></UL></UL></UL>
<P style="MARGIN-LEFT: 135pt; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Symbol; FONT-SIZE: 10pt">·</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">If under 100 M Ohms requires investigation and may require replacement of the wire</SPAN></P>
<P style="MARGIN-LEFT: 81pt; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Symbol; FONT-SIZE: 10pt">·</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">After the test is complete</SPAN></P>
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<LI style="VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-SIZE: 10pt">Land the positive and negative at the combiner box</SPAN> <SPAN style="FONT-SIZE: 10pt"></SPAN></LI>
<LI style="VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-SIZE: 10pt">Close one fuse holder at CB1 and close the integrated CB/rooftop DC disconnect protecting the output of the CB</SPAN> <SPAN style="FONT-SIZE: 10pt"></SPAN></LI>
<LI style="VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-SIZE: 10pt">test for voltage and polarity between the positive and negative output circuits from CB1 at the inverter and verify that they are properly labeled</SPAN> <SPAN style="FONT-SIZE: 10pt"></SPAN></LI>
<LI style="VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-SIZE: 10pt">Open the CB/rooftop DC disconnect and then open the fuse holder in CB#1</SPAN> <SPAN style="FONT-SIZE: 10pt"></SPAN></LI>
<LI style="VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-SIZE: 10pt">Verify that the voltage has bled down to zero then land the positive and negative wires for this combiner box at the inverter</SPAN> <SPAN style="FONT-SIZE: 10pt"></SPAN></LI>
<LI style="VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-SIZE: 10pt">Repeat steps for each CB until all polarity and wire locations are identified and landed</SPAN> <SPAN style="FONT-SIZE: 10pt"></SPAN></LI>
<LI style="VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-SIZE: 10pt">Once all the positive and negative wires from the CB's are landed, if applicable test continuity of the fuses at the inverter disconnect and insert into holders </SPAN></LI></UL></UL></UL>
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<P style="MARGIN-LEFT: 0.75in; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">o</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">AC Wiring Circuits - Insulation testing of wires from AC Tie in point (POCC) to Inverter and verification of phasing</SPAN></P>
<P style="MARGIN-LEFT: 81pt; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Symbol; FONT-SIZE: 10pt">·</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">Test conditions:</SPAN></P>
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<LI style="VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-SIZE: 10pt">Testing to be done at the inverter</SPAN> <SPAN style="FONT-SIZE: 10pt"></SPAN></LI>
<LI style="VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-SIZE: 10pt">All wires are run in conduit, cut to length, labeled, spliced if applicable and conduit covers are on from AC Point of Connection through to the inverter</SPAN> <SPAN style="FONT-SIZE: 10pt"></SPAN></LI>
<LI style="VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-SIZE: 10pt">Only the ground wires are landed in both the Main Service Panel and the inverter </SPAN></LI>
<LI style="VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-SIZE: 10pt">The GFDI fuse is removed from the inverter</SPAN> <SPAN style="FONT-SIZE: 10pt"></SPAN></LI>
<LI style="VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-SIZE: 10pt">All conductors are taped off at the opposite end of where the Megohmeter will be attached and are safely isolated to prevent touching of anything and in a safe position to be energized</SPAN> <SPAN style="FONT-SIZE: 10pt"></SPAN></LI></UL></UL></UL>
<P style="MARGIN-LEFT: 81pt; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Symbol; FONT-SIZE: 10pt">·</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">Test</SPAN></P>
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<LI style="VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-SIZE: 10pt">Megger test all wires to ground at 1000Vdc </SPAN></LI>
<LI style="VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-SIZE: 10pt">Megger test all wires that share a conduit at any point in the system to each other at 1000Vdc</SPAN> <SPAN style="FONT-SIZE: 10pt"></SPAN></LI>
<LI style="VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-SIZE: 10pt">record all values and troubleshoot any wires that have a reading under 100 M Ohms corrected for Temp and humidity</SPAN> <SPAN style="FONT-SIZE: 10pt"></SPAN></LI></UL></UL></UL>
<P style="MARGIN-LEFT: 135pt; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Symbol; FONT-SIZE: 10pt">·</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">If under 100 M Ohms requires investigation and may require replacement of the wire</SPAN></P>
<P style="MARGIN-LEFT: 81pt; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Symbol; FONT-SIZE: 10pt">·</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">After the test is complete</SPAN></P>
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<LI style="VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-SIZE: 10pt">Land the conductors in the inverter being sure to follow the inverter manufacturer’s guidelines for torque settings and use a permanent marker to create a straight line across the screw indicating the proper torque setting</SPAN> <SPAN style="FONT-SIZE: 10pt"></SPAN></LI>
<LI style="VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-SIZE: 10pt">This test will likely be completed before the building shut down to interconnect the system. Do not land the conductors at the AC tie-in point until the panel has been properly de-energized</SPAN> <SPAN style="FONT-SIZE: 10pt"></SPAN></LI>
<LI style="VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-SIZE: 10pt">After the Service Panel or tie-in point is de-energized, land the conductors at the AC tie-in point. Be sure to follow the manufacturer’s guidelines for proper torque settings and use a permanent marker to create a straight line across the screw indicating the proper torque setting.</SPAN> <SPAN style="FONT-SIZE: 10pt"></SPAN></LI></UL></UL></UL>
<P style="LINE-HEIGHT: normal; MARGIN-BOTTOM: 0pt; MARGIN-LEFT: 49.5pt; MARGIN-RIGHT: 0in" class=MsoListParagraph><SPAN style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">o</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">Connection testing</SPAN></P>
<P style="MARGIN-LEFT: 81pt; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Symbol; FONT-SIZE: 10pt">·</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">Test conditions:</SPAN></P>
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<LI style="VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-SIZE: 10pt">Testing to be done at all locations</SPAN> <SPAN style="FONT-SIZE: 10pt"></SPAN></LI>
<LI style="VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-SIZE: 10pt">All wires are landed</SPAN> <SPAN style="FONT-SIZE: 10pt"></SPAN></LI></UL></UL></UL>
<P style="MARGIN-LEFT: 81pt; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Symbol; FONT-SIZE: 10pt">·</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">Test</SPAN></P>
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<LI style="VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-SIZE: 10pt">Test all wires for proper torque settings - refer to manufacturer installation manual</SPAN> <SPAN style="FONT-SIZE: 10pt"></SPAN></LI>
<LI style="VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-SIZE: 10pt">Physically tug on all wires for a visual inspection of loose connections </SPAN></LI></UL></UL></UL>
<P style="MARGIN-LEFT: 1.5in" class=MsoNormal><SPAN style="FONT-SIZE: 10pt">NOTE - All conductors #4 and larger should be marked with a straight line on the screw once they have been tightened to the appropriate setting</SPAN></P>
<P style="MARGIN-LEFT: 81pt; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Symbol; FONT-SIZE: 10pt">·</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">After the test is complete</SPAN></P>
<P style="MARGIN-LEFT: 1.5in; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Wingdings; FONT-SIZE: 10pt">§</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">Close all fuse holders at each combiner box</SPAN></P>
<P style="MARGIN-LEFT: 1.5in; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Wingdings; FONT-SIZE: 10pt">§</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">Close all DC disconnects associated with each combiner box</SPAN></P>
<P style="MARGIN-LEFT: 1.5in" class=MsoNormal><SPAN style="FONT-SIZE: 10pt"> </SPAN></P>
<P style="MARGIN-LEFT: 9pt; VERTICAL-ALIGN: middle" class=MsoNormal><B><SPAN style="FONT-SIZE: 10pt">System Commissioning</SPAN></B></P>
<P style="MARGIN-LEFT: 1in; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">o</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">You are now ready to Commission the inverter</SPAN></P>
<P style="MARGIN-LEFT: 0.75in; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">o</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">Follow inverter manufacturer commissioning procedures</SPAN></P>
<P style="MARGIN-LEFT: 0.75in; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">o</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">Complete the balance of the combiner box commissioning worksheet, the initial start up and inverter commissioning worksheet</SPAN></P>
<P style="MARGIN-LEFT: 0.75in" class=MsoNormal><SPAN style="FONT-SIZE: 10pt"> </SPAN></P>
<P style="MARGIN-LEFT: 0.75in" class=MsoNormal><SPAN style="FONT-SIZE: 10pt"> </SPAN></P>
<P style="MARGIN-LEFT: 81pt; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Symbol; FONT-SIZE: 10pt">·</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">Imp Testing of source circuits</SPAN></P>
<P style="MARGIN-LEFT: 1.5in; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Wingdings; FONT-SIZE: 10pt">§</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">Test conditions:</SPAN></P>
<P style="MARGIN-LEFT: 135pt; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Symbol; FONT-SIZE: 10pt">·</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">Testing to be conducted at combiner boxes</SPAN></P>
<P style="MARGIN-LEFT: 135pt; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Symbol; FONT-SIZE: 10pt">·</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">System is up and running </SPAN></P>
<P style="MARGIN-LEFT: 1.5in; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Wingdings; FONT-SIZE: 10pt">§</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">Test</SPAN></P>
<P style="MARGIN-LEFT: 135pt; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Symbol; FONT-SIZE: 10pt">·</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">At each combiner box, check for operating current of each string by placing a clamp meter around each positive source circuit - record the value on the combiner box commissioning worksheet</SPAN></P>
<P style="MARGIN-LEFT: 135pt; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Symbol; FONT-SIZE: 10pt">·</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">Simultaneously record the irradiance value at the plane of the module for the strings of which you are testing</SPAN></P>
<P style="MARGIN-LEFT: 135pt; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Symbol; FONT-SIZE: 10pt">·</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">Repeat for all strings in the combiner box </SPAN></P>
<P style="LINE-HEIGHT: normal; MARGIN-BOTTOM: 0pt; MARGIN-LEFT: 1in; MARGIN-RIGHT: 0in" class=MsoListParagraph><SPAN style="FONT-FAMILY: Wingdings; FONT-SIZE: 10pt">§</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">Imp Testing of output circuits</SPAN></P>
<P style="MARGIN-LEFT: 1.5in; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Wingdings; FONT-SIZE: 10pt">§</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">Test conditions:</SPAN></P>
<P style="MARGIN-LEFT: 135pt; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Symbol; FONT-SIZE: 10pt">·</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">Testing to be conducted at the inverter</SPAN></P>
<P style="MARGIN-LEFT: 135pt; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Symbol; FONT-SIZE: 10pt">·</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">System is up and running</SPAN></P>
<P style="MARGIN-LEFT: 1.5in; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Wingdings; FONT-SIZE: 10pt">§</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">Test</SPAN></P>
<P style="MARGIN-LEFT: 135pt; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Symbol; FONT-SIZE: 10pt">·</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">Check for operating current of each CB output circuit by placing a clamp meter around each positive wire - record the value on the inverter commissioning worksheet</SPAN></P>
<P style="MARGIN-LEFT: 135pt; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Symbol; FONT-SIZE: 10pt">·</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">Simultaneously record the irradiance value at the plane of the representative modules for the combiner box of which you are testing </SPAN></P>
<P style="MARGIN-LEFT: 135pt; VERTICAL-ALIGN: middle" class=MsoNormal><SPAN style="FONT-FAMILY: Symbol; FONT-SIZE: 10pt">·</SPAN><SPAN style="FONT-FAMILY: 'Times New Roman', 'serif'; FONT-SIZE: 7pt"> </SPAN><SPAN style="FONT-SIZE: 10pt">Repeat for all output circuits from each combiner box</SPAN></P>
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<P class=MsoNormal><SPAN style="COLOR: #1f497d"> </SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d"> </SPAN></P>
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<P class=MsoNormal><SPAN style="COLOR: #595959">-Chris Anderson</SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #595959; FONT-SIZE: 9pt"> Chief Technology Officer</SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #595959; FONT-SIZE: 9pt"> Resources Group </SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #595959; FONT-SIZE: 9pt"> C: 603-732-2411</SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #595959; FONT-SIZE: 9pt"> Borrego Solar Systems</SPAN></P></DIV>
<P class=MsoNormal><SPAN style="COLOR: #1f497d"> </SPAN></P>
<DIV>
<DIV style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid; BORDER-RIGHT: medium none; PADDING-TOP: 3pt">
<P class=MsoNormal><B><SPAN style="FONT-FAMILY: 'Tahoma', 'sans-serif'; FONT-SIZE: 10pt">From:</SPAN></B><SPAN style="FONT-FAMILY: 'Tahoma', 'sans-serif'; FONT-SIZE: 10pt"> re-wrenches-bounces@lists.re-wrenches.org [mailto:re-wrenches-bounces@lists.re-wrenches.org] <B>On Behalf Of </B>David Palumbo<BR><B>Sent:</B> Monday, September 14, 2009 10:58 PM<BR><B>To:</B> 'RE-wrenches'<BR><B>Subject:</B> Re: [RE-wrenches] Insulation testing</SPAN></P></DIV></DIV>
<P class=MsoNormal> </P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">I’d like to see if we can complete the thread on insulation testers (Meggers). Below is a copy of Bill Brooks last posting on this subject from several weeks ago. </SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt"> </SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">Bill says the keys are to use the tester and in “performing the tests properly and safely which requires test procedures”. What are the proper testing procedures? We have a Fluke 1503 and the information that came with it is not very helpful in setting up a testing procedure. The DVD that came with it is more of a sales tool on why you should have the tool. We already have the tool. We want to know how to use the tool. Can anybody give advice on this?</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt"> </SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt"> </SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt"><< I bought two insulation testers (Megger is a brand name) in April. A used</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">Fluke 1520 off Ebay for $275 and a new inexpensive (cheap) insulation tester</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">on Amazon (Electronic Specialties 550 Insulation Tester for $162). Both work</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">fine. The Fluke has better accuracy that I need for very specialized "field</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">wet resistance testing" (FWRT). However, the cheap tester works great for</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">finding faults in conductors and severe faults in modules. </SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt"> </SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">I bought both to determine if a cheap meter would work and the answer is</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">YES. The key is performing the tests properly and safely which requires test</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">procedures. The other key to actually use the tester. Several people own</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">these devices, but never use them. They should be used on every installation</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">after the wire is installed to determine if any wire damage is visible to</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">the tester. Even though this will not solve all field mistakes, it will</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">catch the marginal problems that may be too small to be detected by the GFP</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">circuit in the inverter.</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt"> </SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt">Bill. >></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Courier New'; FONT-SIZE: 10pt"> </SPAN></P>
<P class=MsoNormal> </P>
<P class=MsoNormal><I>David Palumbo</I></P>
<P class=MsoNormal><I>President, Independent Power LLC</I></P>
<P class=MsoNormal><I>462 Solar Way Drive, Hyde Park, VT 05655</I></P>
<P class=MsoNormal>NABCEP Certified</P>
<P class=MsoNormal><I><A href="http://www.independentpowerllc.com/" target=_blank>www.independentpowerllc.com</A> </I></P>
<P class=MsoNormal><I>(802) 888-7194</I></P>
<P class=MsoNormal> </P>
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