I recently took a pull box cover off and saw the following. Here there were some galvanized deck pipes going into a pull box but are not entered into the box via a KO. So the installers used a bonding #6 from pipe to pipe and then to the box.
I had been told by someone that one of the breakers that feed the wired that are in these pipes (think they're 350's) had a dead short but the breaker blew only after like 30 seconds or so (Unsure of the time but it was long). Then I ran into the burned up bond.
Is the #6 too small? Should it be determined by article number 250.66 or 250.122? Or some other sections.
Thanks
http://www.turboimagehost.com/p/7674550/Bond.png.html
http://www.turboimagehost.com/p/7674551/Burned_Bond.png.html
I had been told by someone that one of the breakers that feed the wired that are in these pipes (think they're 350's) had a dead short but the breaker blew only after like 30 seconds or so (Unsure of the time but it was long). Then I ran into the burned up bond.
Is the #6 too small? Should it be determined by article number 250.66 or 250.122? Or some other sections.
Thanks
http://www.turboimagehost.com/p/7674550/Bond.png.html
http://www.turboimagehost.com/p/7674551/Burned_Bond.png.html