Per 250.97 bonding jumper.

[reyamkram]

In my jurisdiction ( Schaumburg, Il ) we are on the 2014 code cycle. OK, the question is when did 250.97-come out, with circuits 277-480 termining at ring knokouts must be bounded with a bounding jumper. ??? dose it apply to the 2014 code cycle??

Thank you, for any and all information.

 

[augie47]

Been in for ages. The oldest book handy is '99 and it is there.

 

[tom baker]

I started in 78 and it was code then.
Its not all ringed KOs, a code change about 15 years ago allows 4S boxes that are listed for use without bonding jumpers.

 

[reyamkram]

Been in for ages. The oldest book handy is '99 and it is there.

Thank you very munch for the infromation