Stand Alone PV system volt / amp problem [RE-wrenches]

Dan Rice danrice at scinternet.net
Fri Apr 8 00:52:25 PDT 2005


Your free subscription is supported by today's sponsor:
-------------------------------------------------------------------
Help us support US Troops – Just Register Here.
http://click.topica.com/caadlVxbz8Qcsbz9JC9a/Permission Data
-------------------------------------------------------------------

Chris,

Ditto Phil and Barbara. One other thought -you may want to double check for
multiwire branch circuits that share a neutral between two 120 V legs fed
from opposite buses in the load center. (See NEC Article 100 for a
definition and 200.4 for other requirements). A shared neutral in your
situation could lead to an overload. I'm not that familiar with wiring in
manufactured homes. Multiwire branch circuits often feed kitchen small
appliance circuits and other general receptacle circuits serving areas
located near one another. A quick way to search is to look for the "red
wire" in the load center. Two conductor NM cable is usually one black and
one white wire (with a bare equipment grounding conductor). Three conductor
NM usually consists of one black, one red, and one white conductor (also
with a bare equipment grounding conductor). Three conductor NM may be used
for a multi-wire branch circuit, with the black and red "line" conductors
fed from adjacent breakers that are connected to opposite buses. In a 240
VAC-fed load center, the neutral carries the difference between the two line
loads. In a 120 VAC-fed panel such as you've configured, the neutral carries
the sum of the two line loads. Check out this link to John Wiles' "Code
Corner" article on this topic:
http://www.nmsu.edu/%7Etdi/pdf-resources/cc59.pdf  By the way, the presence
of the "red wire" does not necessarily mean that there's a multiwire branch
circuit, nor does the absence of a red wire mean that there are none. From
the inspector's point of view, demonstrating that there are no multiwire
branch circuits may help ease his concerns that a single 120 VAC source
would cause problems.

One other point. If there are any 240 VAC receptacle circuits in the home
(range, dryer), you may help yourself with the inspector to disconnect and
properly terminate the conductors and remove the 240 VAC receptacles,
eliminating the possibility that someone may plug in an appliance to an
incorrectly configured receptacle.

Good luck.

Dan Rice
Abundant Sun, LLC.
435-826-4565


----- Original Message ----- 
From: "Chris Anderson" <chris at borregosolar.com>
To: <RE-wrenches at topica.com>
Sent: Thursday, April 07, 2005 10:24 AM
Subject: Stand Alone PV system volt / amp problem [RE-wrenches]




Any help on this one would be appreciated.

Your free subscription is supported by today's sponsor:
-------------------------------------------------------------------
Want a laptop? Get an Apple iBook for free! 
http://click.topica.com/caadlVBbz8Qcsbz9JC9f/Amazing Computer 
-------------------------------------------------------------------

- - - -
To send a message: RE-wrenches at topica.com

Archive of previous messages: http://lists.topica.com/lists/RE-wrenches/read

List rules & etiquette: www.mrsharkey.com/wrenches/etiquette.php

Check out participant bios: www.mrsharkey.com/wrenches/

Hosted by Home Power magazine

Moderator: michael.welch at homepower.com
--^----------------------------------------------------------------
This email was sent to: michael.welch at homepower.com

EASY UNSUBSCRIBE click here: http://topica.com/u/?bz8Qcs.bz9JC9.bWljaGFl
Or send an email to: RE-wrenches-unsubscribe at topica.com

For Topica's complete suite of email marketing solutions visit:
http://www.topica.com/?p=TEXFOOTER
--^----------------------------------------------------------------







More information about the RE-wrenches mailing list