CALIF_C10
Member
- Location
- N. California
Here's my situation:
I have been asked to install and wire two stand by generators for a 3000 amp existing service. I just happened to notice the Utility transformer is 1500KVA 480/277 volt. First thing I thought was this is not big enough to feed the service. If I calc'ed this correctly, I figured this transformer for around 1800 amps. The utility district told me they figured the size based on 277 volts. Which is the correct method?:-?
And FYI, this MSB has 800 & 600 amp breakers currently in use and a 1600 amp breaker which is going to be in use in about a month or so. The transformer at this time is warm to hot and humms like a bee farm. I'm just a little worried when that 1600 amp breaker is closed and the entire service is in full use. Anticipated full load amps is about 2400 amps.
I have been asked to install and wire two stand by generators for a 3000 amp existing service. I just happened to notice the Utility transformer is 1500KVA 480/277 volt. First thing I thought was this is not big enough to feed the service. If I calc'ed this correctly, I figured this transformer for around 1800 amps. The utility district told me they figured the size based on 277 volts. Which is the correct method?:-?
And FYI, this MSB has 800 & 600 amp breakers currently in use and a 1600 amp breaker which is going to be in use in about a month or so. The transformer at this time is warm to hot and humms like a bee farm. I'm just a little worried when that 1600 amp breaker is closed and the entire service is in full use. Anticipated full load amps is about 2400 amps.