Multiwire branch circuit

[hhsting]

I have plans that show 3#12 phase and 3#12 neutral in same conduit for sys furniture. There are 3 single pole breakers feeding this. The plans show handle ties per code. I am confused are these multi-wire branch circuit that require handle ties?

 

[david luchini]

I am confused are these multi-wire branch circuit that require handle ties?

No, these are not multi-wire branch circuits.

 

[infinity]

The plans show handle ties per code.

What code section?

 

[hhsting]

What code section?

No code section on plans written.

 

[tom baker]

Then ask submitter for code section

 

[wwhitney]

There's 210.7, which might apply depending on how the "sys furniture" connects to the premises wiring.

Cheers, Wayne

 

[hhsting]

There's 210.7, which might apply depending on how the "sys furniture" connects to the premises wiring.

Cheers, Wayne

How can it apply? There are 3 phase conductors and there are 3 neutral conductors brought to system furniture for power. How this can be multiwire?

 

[Tulsa Electrician]

There's 210.7, which might apply depending on how the "sys furniture" connects to the premises wiring.

Cheers, Wayne

How can it apply? There are 3 phase conductors and there are 3 neutral conductors brought to system furniture for power. How this can be multiwire?

As mentioned.
Depends on furniture whip.
Some come with a netural and some with separate grounded conductors per leg.
Some also have normal power and some with both normal and ups back up.
I would say the plans cover for both types. Grounded conductor or netural hook up.
Ask furniture supplier for there diagram?
Some even have a boat and also two isolated. They come in all sorts of configurations.
I would say if the plans call for both do it that way to head off an issue on install and insp.

 

[wwhitney]

How can it apply? There are 3 phase conductors and there are 3 neutral conductors brought to system furniture for power. How this can be multiwire?

210.7 doesn't say anything about multiwire branch circuits. It says:

210.7 Multiple Branch Circuits. Where two or more branch circuits supply devices or equipment on the same yoke or mounting strap, a means to simultaneously disconnect the ungrounded supply conductors shall be provided at the point at which the branch circuits originate.

Cheers, Wayne

 

[wwhitney]

Apparently Furniture Systems are covered by Article 605, which I haven't read before. I don't see a requirement for a disconnect there. But 605.5 allows the furniture system to interconnect with the building wiring via a short length of cord with an attachment plug. If that connection method is used, then the special receptacle for that cord would need to satisfy 210.7, requiring the handle ties.

Cheers, Wayne

 

[augie47]

I agree with TulsaElctrician n that it's possible the furniture is wired as a multi-wire or common yoke. If the plans call for a handle-tie, follow the plans.