Furniture system fed from 2 electrical panels

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cppoly

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A wiring scheme for a furniture system calls for 3 circuits from one panel and 1 circuit from another panel. How do you go about disconnecting power to all circuits to work on the furniture system?
 
cppoly said:
A wiring scheme for a furniture system calls for 3 circuits from one panel and 1 circuit from another panel. How do you go about disconnecting power to all circuits to work on the furniture system?
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You walk to one panel than the other. :)

The disconnecting requirement wording allows for that.

The scheme you present is a common one.
 
:) How would you know the furniture is fed from 2 panels then? Is there a labeling requirement at the breakers or at the furniture?
 
cppoly said:
:) How would you know the furniture is fed from 2 panels then? Is there a labeling requirement at the breakers or at the furniture?
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Here is the requirement from the 2008 NEC

605.7 Freestanding-Type Partitions. Partitions of the
freestanding type (not fixed) shall be permitted to be connected
to the building electrical system by one of the wiring
methods of Chapter 3. Multiwire branch circuits supplying
power to permanently connected freestanding partitions
shall be provided with a means to disconnect simultaneously
all ungrounded conductors at the panelboard where
the branch circuit originates.
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Notice it applies only to each MWBC.

It has now been removed from 605 and covered by 240.
 
petersonra said:
how would you know where to disconnect the power if it was only one one panel?
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Would it matter as long as there is a multiwire branch circuit common disconnect such as a handle tie? All power would be disconnected without the possibility of a circuit being energized.
 
i don't think any of this stuff about MWC has anything to do with the OP's question about running circuits from multiple panelboards.
 
petersonra said:
i don't think any of this stuff about MWC has anything to do with the OP's question about running circuits from multiple panelboards.
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I agree but some think that you need a way to simultaneously disconnect ALL circuits to the partition not just for the MWBC's.
 
petersonra said:
i don't think any of this stuff about MWC has anything to do with the OP's question about running circuits from multiple panelboards.
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It does and it doesn't.

The OP was concerned about the common disconnect requirement I posted.

I pointed out it only applies to each MWBC not all the circuits combined.

This is a pretty common question that I know some AHJ have issues with.
 
Just curious, even though the furniture manufacturer wiring CAN accommodate 3 circuits from 1 panel and another circuit from another panel, doesn't mean you MUST wire it that way correct?

Meaning, why not just take that extra circuit out of the original panel and call it a day? Circuits, 1,3,5,7. Who's to say that if 7 is fed from another panel it does anything different?
 
cppoly said:
Just curious, even though the furniture manufacturer wiring CAN accommodate 3 circuits from 1 panel and another circuit from another panel, doesn't mean you MUST wire it that way correct?

Meaning, why not just take that extra circuit out of the original panel and call it a day? Circuits, 1,3,5,7. Who's to say that if 7 is fed from another panel it does anything different?
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It was common to feed one isolated ground circuit from a "clean" panel for computers.

Also, some equipment is sensitive to a neutral to ground voltage, so a dedicated neutral reduced that.
 
cppoly said:
Just curious, even though the furniture manufacturer wiring CAN accommodate 3 circuits from 1 panel and another circuit from another panel, doesn't mean you MUST wire it that way correct?

Meaning, why not just take that extra circuit out of the original panel and call it a day? Circuits, 1,3,5,7. Who's to say that if 7 is fed from another panel it does anything different?
Click to expand...

You can do it that way. You can even use only one circuit in many cases.
 
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