MLO Meterstack and one main bonding jumper

[hhsting]

I have 600A MLO meterstack with 4x 200A meter/breaker. The meterstack is fed from utility service conductor.

Under NEC 2017 Article 250.24(B) exception no. 1 would this be considered an assembly listed for use as service equipment so that one main bonding jumper is provided or it needs to be provided at each 200A meter/breaker?

 

[don_resqcapt19]

would this be considered an assembly listed for use as service equipment

If the assembly is not listed as suitable for use as service equipment you can't use it as service equipment.

 

[hhsting]

If the assembly is not listed as suitable for use as service equipment you can't use it as service equipment.

Ok but can their be one main bonding jumper instead of being in each 200A breaker in the meter stack post#1?


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[jaggedben]

Yes. See 250.24(C) exception 1. I assuming it's a listed assembly and SUSE, because of the way you're describing it used. Out of curiosity, is this a new meter stack that meets the requirements for each breaker to be in a separate compartment?

 

[jaggedben]

To clarify Don's point, to confirm it's a listed assembly and SUSE you look at the labeling and instructions. If it is, then 250.24(C) exception 1 would apply, which I think was your question.

 

[hhsting]

Yes. See 250.24(C) exception 1. I assuming it's a listed assembly and SUSE, because of the way you're describing it used. Out of curiosity, is this a new meter stack that meets the requirements for each breaker to be in a separate compartment?

This is new meter stack. Not sure what you mean by meeting requirements for each breaker in separate compartment. Below is the snapshot. Can you tell?

 

[don_resqcapt19]

This is new meter stack. Not sure what you mean by meeting requirements for each breaker in separate compartment. Below is the snapshot. Can you tell?

I think you are still on the 2017 so that should be compliant...it would not be compliant starting with the 2020.