Balanced 3 Phase Loads

Status
Not open for further replies.
R

RC900

Member
Location
Houston, Texas, Harris
Power Source: 277/480 Y 3 Phase 4 Wire
Loads: LED Fixtures, Single Phase Connection 277, (Used current draw to calculate VA)

Was looking to balance the loads on a 3 phase electrical panel.
Circuit 1 has 5585 VA connected to Phase A.
Circuit 3 has 5585 VA connected to Phase B.

I have five other circuits that add up to 5510 VA; therefore I was thinking to connecting these to Phase C on:
Circuits 11
Circuits 17
Circuits 23
Circuits 29
Circuits 4

What is the % difference between phases before a 3 phase system is not balanced.

Will this panel still be considered balanced if only circuit 1 is on while all the others are off?

If this were a sub panel, would it effect other equipment connect on other panels?
 
no standard percentage
imo you get within +/- 10% of the avg that is 'balanced'

no

no (other than the usual harmonics)

using 5585, 5585, 5510 neut <0.2 A
<1% from avg
 
Should I just size the neutral conductor the same as phase conductors, and this will allow the system to run unbalanced?
Lights will be on at different times, not all at once.
 
RC900 said:
The current draw was provided by the manufacture.
It includes the current draw of the fixture and driver.

Please advise if this is not correct.

Thank you.
Click to expand...

Yes, per 220.18 NEC.

The required VA for these fixtures is the actual info on the fixture.

Never rely on bulb wattage.

Also a quick one time amperage reading from a meter is not viable either, readings can vary for many reasons.
 
Status
Not open for further replies.
Top