I have a (customer) owner of a Metal Fabricating business, who is renting a building with an existing 400a 3ph service(OH) with a Large panel inside, back to back. Square D QO plug-in with no main rated for 400 amps.
Problems:
The business owner had JOE SHMO about 6 years ago do some work for their business applications.
(1) Added (5) 3ph sub-panels from main panel on feed through lugs on bottom of main panel.
I have resolved (7).
I told the customer He needs to address this problem.
I have proposed a new indoor panel Spectra Bolt-on panel 1200a ML
with Appropriate THQD breakers to protect the sub wires and/or sub panel capacity, bond bushings,etc.
Where this gets tricky is:
In the mean time I pulled the 400 amp fuses out of the outside disconnect
and put in 300s for the time being to lessen potential problems (keep in mind this system has been in operation for years) and customer does not want to put in 225 amp fuses for fear of blowing one and damaging 3/0 equipment. He will allow a load test while under load to see if the 225s can be installed. They don't make a 200 amp fuse that will fit the disconnect I am told.
If he does not accept the 225a fuses and proposal (for cost reasons only, he wants to do something about it),what recourse do I have to keep liability off my company and on the owners. I will be talking with the AHJ about this either way.
Problems:
The business owner had JOE SHMO about 6 years ago do some work for their business applications.
(1) Added (5) 3ph sub-panels from main panel on feed through lugs on bottom of main panel.
- Feeders to sub panels are 3/0 copper.
- No EGC to sub-panels ,used pipe as ground with no bond bushings (actually no bushings at all).
- Most sub panels are rated for 200 amps
- One sub-panel is rated 150 Amps with some conductors of the 3/0 cut to fit the lugs
- Not one sub-panel has main breaker.
- For 3 phase corded equipment, used single phase 120/240 30 amp twist locks (save money??)
I have resolved (7).
I told the customer He needs to address this problem.
I have proposed a new indoor panel Spectra Bolt-on panel 1200a ML
with Appropriate THQD breakers to protect the sub wires and/or sub panel capacity, bond bushings,etc.
Where this gets tricky is:
In the mean time I pulled the 400 amp fuses out of the outside disconnect
and put in 300s for the time being to lessen potential problems (keep in mind this system has been in operation for years) and customer does not want to put in 225 amp fuses for fear of blowing one and damaging 3/0 equipment. He will allow a load test while under load to see if the 225s can be installed. They don't make a 200 amp fuse that will fit the disconnect I am told.
If he does not accept the 225a fuses and proposal (for cost reasons only, he wants to do something about it),what recourse do I have to keep liability off my company and on the owners. I will be talking with the AHJ about this either way.