Modular furniture disconnects

[MCE001]

When wiring modular furniture how do meet the 210.4b disconnect requirements without a 4 pole breaker tie.

 

[luckylerado]

When wiring modular furniture how do meet the 210.4b disconnect requirements without a 4 pole breaker tie.

Handle ties are acceptable but how are you going to share a neutral among 4 circuits without double phasing?

 

[infinity]

As Lucky stated you only need the handle tie for the MWBC's sharing a neutral.

 

[iwire]

When wiring modular furniture how do meet the 210.4b disconnect requirements without a 4 pole breaker tie.

You will never need a four pole even if you have furniture that uses four breakers.

At most you would need to tie three breakers together.

 

[GoldDigger]

Because of the hazards associated with non linear loads and shared neutrals, some modular furniture is wired for two hots (two of the three phase conductors) sharing one neutral and the third phase wire, designated for computers, with its own separate neutral.
That does not completely deal with harmonics on the shared neutral, and it makes both neutrals count as CCCs, but it greatly reduces the potential problems.

 

[MCE001]

the system being used is a 3+1 system, 3 ckts to 1 neutral and grd and 1 ckt with a dedicated neutral and dedicated ground. 210.b4 states all multi ckt branch wiring must be disconnected from a single point. Is the modular wiring harness for the furniture considered a a multiwire branch ckt?

 

[jumper]

the system being used is a 3+1 system, 3 ckts to 1 neutral and grd and 1 ckt with a dedicated neutral and dedicated ground. 210.b4 states all multi ckt branch wiring must be disconnected from a single point. Is the modular wiring harness for the furniture considered a a multiwire branch ckt?

The harness is not a MWBC, your "3 ckts to 1 neutral and grd" is and needs a handle tie

 

[infinity]

This may help from NEC Article 100:

Branch Circuit, Multiwire. A branch circuit that consists
of two or more ungrounded conductors that have a voltage
between them, and a grounded conductor that has equal
voltage between it and each ungrounded conductor of the
circuit and that is connected to the neutral or grounded
conductor of the system.

 

[iwire]

the system being used is a 3+1 system,

I understand, it is a common set up

3 ckts to 1 neutral and grd

That is a MWBC and that circuit required handle ties

and 1 ckt with a dedicated neutral and dedicated ground.

That is not part of the MWBC, that is a standard two wire circuit and does not require a handle tie connecting it to the MWBC.