Tie-Handles

[sockie1924]

When installed in a redidential application we had to put a tie-handle on the two breakers that served a set of receptacles that were seperated top and bottom half on a seperate circuit. The breakers had to be tied togerther so that you could kill power to the whole device. Now I am working on a commerical application where per-wired furniture partitions the receptacles are being served from two seperate circuits does this require a tie-handle also? How would you know what receptacles are live and not?

 

[ryan_618]

Re: Tie-Handles

For the first part of your question, 210.4(B) applies only to dwelling units.

For the second part, you use your meter to make sure it is not energized.

 

[jerryb]

Re: Tie-Handles

Also the description of when to kill all power to the multiwire branch circuit is only when you supply power to "one device or equipment on the same yoke". Your description of prewired furniture would not fit this description (for dwelling units),

 

[pierre]

Re: Tie-Handles

210.7(C) Multiple Branch Circuits.

This reference is for all situations (dwellings and other than dwellings) where more than one branch circuit supplies more than one receptacle on the same yoke. This includes multiwire branch circuits and separate multiple single ciruits.

Pierre

 

[don_resqcapt19]

Re: Tie-Handles

Pierre,

This includes multiwire branch circuits and separate multiple single ciruits.

I don't agree that 210.7(C) applies to a multiwire branch circuit. Per Article 100 a "multiwire branch circuit" is a single circuit. 210.4(A) permits, but does not require, a multiwire branch circuit to be considered as multiple circuits. I believe that this problem with the wording in 210.7(C) will be changed in the 2005 code so that it applies to both multiple and multiwire branch circuits connected to a common yoke.
Don

 

[iwire]

Re: Tie-Handles

sockie, I have never seen office furniture with split receptacles, that is two circuits serving one duplex outlet.

Do you mean you have office furniture that has some duplex outlets on one circuit and some duplex's on another circuit?

As long as you do not have circuits sharing the same yoke you do not have to use a common handle on the breakers.

You may if you want to, but it is not required.

 

[a.wayne3@verizon.net]

Re: Tie-Handles

I think that the difference here is that the receptacles are not being split into two single receptacles,by breaking the tabs.But you still have to pigtail the neutrals !!!!!

 

[pierre]

Re: Tie-Handles

Thanks Don for the correction That is one of the reasons I try to look for the responses to my posts.

Pierre

 

[iwire]

Re: Tie-Handles

Originally posted by a.wayne3@verizon.net:
I think that the difference here is that the receptacles are not being split into two single receptacles,by breaking the tabs.But you still have to pigtail the neutrals !!!!!

Allan, in this application there will be no tabs to break or neutrals to pigtail.

Originally posted by sockie1924
per-wired furniture partitions the receptacles are being served from two seperate circuits

Typically all the electrician does with this office furniture is feed a whip of LFMC or FMC with 1 to 6 circuits.

The plugs and wiring harness's are installed by the furniture installers, the plugs themselves plug into a wiring harness inside the partitions.