AC\DC
Senior Member
- Location
- Florence,Oregon,Lane
- Occupation
- EC
Park has 2/0 xhhw aluminum rated at 135 amps. It feeds 4 pedestals 3 are 50-30-20, 1 is 30-20 I get
12000va x 3 =36000. ( at 240volt)
3600va x1 = 3600. (at 120 volts)
Demand factor for feeder for 4 units is 75% so
since phase is imbalanced I get
36000va /240= 150A x75% = 112.5
3600va/120= 30A x 75% =22.5
So one phase is 112.5 amps
Other side is 135 amps.
On the phase that is 112.5 amps I am coming of for a control panel for a pump and its rated at 21 FLA so
I am now on other phase at
133.5 amps
Look good? I thought the lugs on the line side of the pedestals were rated for 90C but I don't see any markings on them and from reading seems no equipment is rated at 90c. Reason I mentioned this is because I thought if I installed a Polaris at the breaker rated for 90c I could use the 90c coulomb but seems I would need to also use Polaris on the line side of the pedestals so now its going to be easier to just make sure everything is on the side the 30amp is not on.
12000va x 3 =36000. ( at 240volt)
3600va x1 = 3600. (at 120 volts)
Demand factor for feeder for 4 units is 75% so
since phase is imbalanced I get
36000va /240= 150A x75% = 112.5
3600va/120= 30A x 75% =22.5
So one phase is 112.5 amps
Other side is 135 amps.
On the phase that is 112.5 amps I am coming of for a control panel for a pump and its rated at 21 FLA so
I am now on other phase at
133.5 amps
Look good? I thought the lugs on the line side of the pedestals were rated for 90C but I don't see any markings on them and from reading seems no equipment is rated at 90c. Reason I mentioned this is because I thought if I installed a Polaris at the breaker rated for 90c I could use the 90c coulomb but seems I would need to also use Polaris on the line side of the pedestals so now its going to be easier to just make sure everything is on the side the 30amp is not on.
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