D Hollenbeck
Member
- Location
- Springfield Va.
backup power for customer..
backup power for customer..
I had to supervise the install of battery backup systems in a DoD facility as contractors weren't cleared. We purchased several battery backup systems, on 4 foot high portable wheeled racks, and of course building didn't have outlets for them. All came with L6-30p cordsets. The building was 208v. The contract was to install the matching receptacles and they did so with armored cable and what I remember was 10/3g. The breakers were 30 amp. Don't know if this thread refers to battery backups but these were the largest single load the data center had, with no problems.
It's important to note that my boss never mentioned an AHJ inspection. Contractor was assumed to be competent and my checks were security specific but I used to do licensed residential work so some experience there.
In this case, max load would probably be a fully drained battery bank(s) with power restored, and the system charging the batteries while passing thru connected 208v load. There were input circuit breakers on these systems (charger/inverter module) though so there is unlikely to be an overload. We never loaded them down because battery runtime was the most important issue.
backup power for customer..
I had to supervise the install of battery backup systems in a DoD facility as contractors weren't cleared. We purchased several battery backup systems, on 4 foot high portable wheeled racks, and of course building didn't have outlets for them. All came with L6-30p cordsets. The building was 208v. The contract was to install the matching receptacles and they did so with armored cable and what I remember was 10/3g. The breakers were 30 amp. Don't know if this thread refers to battery backups but these were the largest single load the data center had, with no problems.
It's important to note that my boss never mentioned an AHJ inspection. Contractor was assumed to be competent and my checks were security specific but I used to do licensed residential work so some experience there.
In this case, max load would probably be a fully drained battery bank(s) with power restored, and the system charging the batteries while passing thru connected 208v load. There were input circuit breakers on these systems (charger/inverter module) though so there is unlikely to be an overload. We never loaded them down because battery runtime was the most important issue.
