bus bar clamps (was: calculation) [RE-wrenches]

Dan Rice danrice at scinternet.net
Fri Jan 20 11:11:19 PST 2006


Your free subscription is supported by today's sponsor:
-------------------------------------------------------------------
Shopping for a new car? 
Pay 2-3% below invoice on a new car of your choice. 
Save thousands with our free car discount finder service!
http://click.topica.com/caaemrqbz8Qcsbz9JC9a/Dealix
-------------------------------------------------------------------

Bob,

The supply on the line side of the main disconnect is typically a utility
transformer, and is essentially unlimited in the first place (but for the fuse
on the primary side of the utility transformer). Adding additional amperage
from a PV feeder contributes to this quasi-infinite supply to the bus. But, as
with other taps, protection from overload is provided by the overcurrent
protection on the load side of the conductor being tapped. In the case of a tap
on a meter-main bus, the main breaker between that bus and all loads will still
provide the same level of overcurrent protection to that bus, regardless of
what's feeding the bus. As long as the tap connects to a batteryless grid-tie
system which presents no load, the bus cannot be overloaded. A battery backup
grid-tie system with battery charging potential could present a problem in this
case, though, as it would be another load on the bus. In that case, it would be
important to consider downsizing the main breaker at the end of the bus to
accomodate any potential load from battery charging.

I hope that helps.

Dan Rice
Abundant Sun, LLC.


Bob Ellison wrote:

This is an area I don't normally get into, but wouldn't a clamp onto a
buss bar just contribute to the load on the buss bar like using a
breaker adds to the load?

Just getting confused, ( not hard on many day's
Bob


----------------------------------------------------------------
SCI WebMail http://webmail.scinternet.net/

Your free subscription is supported by today's sponsor:
-------------------------------------------------------------------
Jumpstart your love life at AmericanSinglesR.com.  
Meet someone in your area today. Millions of member profiles. 
Create a profile, post photos and search for free.
http://click.topica.com/caaemrrbz8Qcsbz9JC9f/Spark Network
-------------------------------------------------------------------

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

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

List rules & how to change your email address: 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