About the PVGFP [RE-wrenches]

[William Miller]

>To: RE-wrenches at topica.com
>From: William Miller <wrmiller at slonet.org>
>Subject: About the PVGFP [RE-wrenches]
>Date: Thu, 12 Oct 2000 01:58:18 -0700
>Reply-To: RE-wrenches at topica.com
>X-Topica-Loop: 1300002502
>X-Sender: wrmiller at slonet.org
>
>Friends:
>
>I've put in several of the PVGFP circuit breakers from Trace.  I have some
>questions about installing this unit:
>
>There is a white lead, about 2/0, that connects to the isolated negative
>buss and a green lead that looks slightly smaller, that connects to the
>bonded buss.  In the manual it says that these leads can be lengthened or
>shortened but can not be replaced.  It goes on to say that these leads
>"have been factory installed and torqued to UL standards."  Furthermore the
>manual says, "NEC does not allow field connections of two wires (over 12
>AWG) in one pressure terminal."  Inspection of these units shows that there
>are two leads, one of the heavy ones described above, and a smaller lead in
>each lug on the 1 amp pole of the breaker.
>
>What I get out of this is that a factory can put two wires in one lug but a
>field installer cannot.  It can be awkward to have to splice onto one or
>both of these leads and the temptation is to replace the lead with a longer
>one.  If the torque is so critical, I do not understand why the manual
>says, "Periodic tightening of all wire connections... is highly
>recommended."  Also, why is there such heavy gauge wire connected to a 1
>amp circuit breaker?  Am I required to add wire of the same gauge?
>Comments are requested.
>
>On the same subject, does anyone think it odd that these breakers cannot be
>purchased with an enclosure?  I accidentally discovered that a Murray
>LC008DS load center is a great enclosure for the PVGFP, either in the Nema
>1 or Nema 3R style.  One just removes the interior and screws or rivets in
>the GFP breaker.  For the 3 pole or less breakers (actual poles) one can
>use the breaker KOs as they are.  For the 4 pole model, you have to knock
>out on both sides of the center and cut out the center web and then supply
>a small plate to block the side of the larger opening.  What are the rest
>of you doing for enclosures for the PVGFPs?
>
>Also, I called Trace to ask what to use for an isolated negative buss.
>They suggested a DCBB on a piece of wood!  I did some research and found
>that the Ilsco PDB-24-500-1 power distribution block fit (snugly) into a
>DC250 and worked well as an isolated negative.  I can send a photo of
>anyone is interested.
>
>Which brings me to another complaint, that of how small the DC250
>enclosures are...  But I'll save that for another post.
>
>Thanks in advance for your comments.
>
>William Miller
>
>
>__________________________________________________________________
>William Miller
>SLO Communications: Communications and Power Systems Consulting
>Chief Engineer, KCBX: NPR and PRI for San Luis Obispo and Santa Barbara
>PO Box 50, Santa Margarita, CA 93453
>Voice :805-438-5600		Fax: 805-438-4607	VMail: 805-546-4875
>email: wrmiller at slonet.org
>License No. C-10-773985
>_____________________________________________________________
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>"I stand by all the misstatements that I've made." Dan Quayle
>__________________________________________________________________
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__________________________________________________________________
William Miller
SLO Communications: Communications and Power Systems Consulting
Chief Engineer, KCBX: NPR and PRI for San Luis Obispo and Santa Barbara
PO Box 50, Santa Margarita, CA 93453
Voice :805-438-5600		Fax: 805-438-4607	VMail: 805-546-4875
email: wrmiller at slonet.org
License No. C-10-773985
_____________________________________________________________
Compatibility:
Word processor: WP7, Word 7
Spreadsheet: Quatro Pro 7, Excel 5
CAD: Microstation 95, DXF, Autocad V12 DWG, Visio 4.1T
_____________________________________________________________
"I stand by all the misstatements that I've made." Dan Quayle
__________________________________________________________________

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 www.homepower.com

For info contact list moderator by email:
 michael.welch at homepower.com

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