I have a job that I had looked at on Friday and been going over it in my head since, and have not come up with an idea yet so I want to get some opinions.
I looked at a organization?s retirement home, that was just renovated and for the most part was a first class job. Now this is a retirement home not a healthcare facility. There is a 20HP 480 volt fire pump taped before the main with a 200 amp CB. So far so good. Then there is a 150KW generator that with a 225 main CB that hits a distribution panel board then a 200 amp circuit that hits a transfer switch / transformer for some hall, stairwell, some other lighting and some unit heaters. All a very small load. A 100 amp circuit that hits some important HVAC loads sewage ejectors fire alarm and some other building essentials. And then finally a 60 amp circuit for the fire pump transfer switch which is the first problem I found. Now my understanding of why a fire pump is set up the way they are is so it will run until it destroys itself that?s why the locked rotor or 6 times the full load over currant protection. Now what the owners want me to do is connect a 40HP elevator to the generator with a transfer switch that will disconnect the load if the fire pump starts. Which in theory would work out but I am afraid to even touch this because I think you would need a 162 amps for the fire pump alone and even though the load on the other two circuits are light under a 100 amps there is nothing to limit it to that. Am I making too much of this or what.
I looked at a organization?s retirement home, that was just renovated and for the most part was a first class job. Now this is a retirement home not a healthcare facility. There is a 20HP 480 volt fire pump taped before the main with a 200 amp CB. So far so good. Then there is a 150KW generator that with a 225 main CB that hits a distribution panel board then a 200 amp circuit that hits a transfer switch / transformer for some hall, stairwell, some other lighting and some unit heaters. All a very small load. A 100 amp circuit that hits some important HVAC loads sewage ejectors fire alarm and some other building essentials. And then finally a 60 amp circuit for the fire pump transfer switch which is the first problem I found. Now my understanding of why a fire pump is set up the way they are is so it will run until it destroys itself that?s why the locked rotor or 6 times the full load over currant protection. Now what the owners want me to do is connect a 40HP elevator to the generator with a transfer switch that will disconnect the load if the fire pump starts. Which in theory would work out but I am afraid to even touch this because I think you would need a 162 amps for the fire pump alone and even though the load on the other two circuits are light under a 100 amps there is nothing to limit it to that. Am I making too much of this or what.
