Whole Assisted Living Facility Generator and ATS

[tiger4life]

Hello, EDIT: This is a Health & Rehab facility
I am getting conflicting information from different engineers in reference to assisted living generator backup and transfer switches. We have done quite a few of these for a few engineers, whole facility backup we are installing one generator and one transfer switch, this equipment meets NFPA110 and starts and transfers in under 10 seconds. But recently we have been asked to work with this other engineer that is adamant in stating job will require an ATS for Non-essential loads, an ATS for critical loads, and a ATS for Equipment. This one facility has a peak demand of 152kW and we are planning on using a 1200A SER ATS and a 300kW generator to backup entire facility, he disagrees and references Art. 517 and and 517.42(b). My understanding is the 150kVA is speaking of essential loads only which in this case are under the 150kVA.
If our system of generator and ATS will start and transfer under 10 seconds, are we good as other engineers have said?

 

[hillbilly1]

Hello, EDIT: This is a Health & Rehab facility
I am getting conflicting information from different engineers in reference to assisted living generator backup and transfer switches. We have done quite a few of these for a few engineers, whole facility backup we are installing one generator and one transfer switch, this equipment meets NFPA110 and starts and transfers in under 10 seconds. But recently we have been asked to work with this other engineer that is adamant in stating job will require an ATS for Non-essential loads, an ATS for critical loads, and a ATS for Equipment. This one facility has a peak demand of 152kW and we are planning on using a 1200A SER ATS and a 300kW generator to backup entire facility, he disagrees and references Art. 517 and and 517.42(b). My understanding is the 150kVA is speaking of essential loads only which in this case are under the 150kVA.
If our system of generator and ATS will start and transfer under 10 seconds, are we good as other engineers have said?

Is there a generator for life safety already present? Or battery backup? If so, the 10 second rule doesn’t matter, this would be an optional standby system, as long as the existing system is maintained. If the existing system is to be removed, or not maintained, then yes you will need the separate switches.