2500A MCCB service disconnect does not have GFP. What are my options to add GFP?

[main197]

I am thinking of adding shunt trip ground-fault module. Is there anything in the code that prohibits this? What other options are there other than replacing the breaker?

 

[tom baker]

This is on the service disconnect?
What is the voltage?

 

[HEYDOG]

I am thinking of adding shunt trip ground-fault module. Is there anything in the code that prohibits this? What other options are there other than replacing the breaker?

Look at 230.95!

 

[main197]

This is on the service disconnect?
What is the voltage?

Yes, 480V.

 

[infinity]

Do they make a GFPE module for a 2500 amp breaker? We usually see a separate unit built into the cabinet.

 

[main197]

Do they make a GFPE module for a 2500 amp breaker? We usually see a separate unit built into the cabinet.

That I am not sure.

 

[augie47]

I keep thinking something is missing. Odd that you have a 2500 amp service disconnect that was not GFPE originally. Any detail you can add ??

 

[tom baker]

I keep thinking something is missing. Odd that you have a 2500 amp service disconnect that was not GFPE originally. Any detail you can add ??

Same here. That’s why I asked about voltage as the service could be 208.

 

[tom baker]

Adding a module could be done. But replacing the breaker gets into UL listing issues with the MCC

 

[main197]

I keep thinking something is missing. Odd that you have a 2500 amp service disconnect that was not GFPE originally. Any detail you can add ??

The switchboard looks old and it is a 480V 3ph, 3W (it appears that there is no neutral bus). It is a solidly grounded neutral system even though the neutral is not carried to the switchboard. Maybe they didn't have GFP because it is 3ph, 3W?

 

[augie47]

That would make sense if it was fed from an ungrounded system at one time.
May bring about some listing issues.

 

[tom baker]

Could you install a separate enclosure with GFPE Breaker ahead of existing, make that your service disconnect? Then feed existing.

 

[ron]

There might be a more current model of this, but I've seen this connected to the shunt trip of main fused switches and CB's that don't have integral GFP.

https://library.industrialsolutions.abb.com/publibrary/checkout/GEI-86126?TNR=Installation%20and%20Instruction%7CGEI-86126%7CPDF&filename=GEI-86126.pdf

I would contact the manuf of the breaker in question.

 

[jim dungar]

The switchboard looks old and it is a 480V 3ph, 3W (it appears that there is no neutral bus). It is a solidly grounded neutral system even though the neutral is not carried to the switchboard. Maybe they didn't have GFP because it is 3ph, 3W?

Decades ago this was not uncommon, even though the GFP requirement is actually based on system voltage to ground not how many wires are used.