Concentric knockouts on circuits over 250 volts [RE-wrenches]

[Mark Frye]

The interesting thing to me is the issue of UL listings.  If I buy a 
600V DC rated disconnect from my supply house, and ask them to give me a 
copy of the UL listing information, he laughs me out the store and askes 
for the next cash carrying customer.

In any event, I do not bond my DC conduits.  It seems pretty clear that 
250.97 contains it's own exception on this issue:

"250.97 (c) Fittings with shoulders that seat firmly against the box or 
cabinet, such as electrical metallic tubing connectors, flexible metal 
conduit connectors, and cable connectors, with one locknut on the inside 
of boxes and cabinets"

Since I use EMT for my conduit run and I use "electrical metallic tubing 
connectors" wtih one locknut on the inside of the box, I rely on 250.97 
itself to exempt me from bonding the conduit.

Mark Frye
Berkeley Solar Electric Systems


- - - -
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
--^----------------------------------------------------------------