Panel Schedule Calculations

[bcm]

My Esteemed Electrical Friends,

I ran across this panel schedule, and something seemed wrong to me. First off, I'm not used to seeing schedules where they just use L1 and L2. Most panel schedules I have used break up L1 & L2 into 2 columns each so you can
see the exact load being contributed at each circuit breaker.

When I look at this schedule, it seems to me that the BTS pulls 19,000 W and the surge would be pulling 0. Anyhow...

I can't figure out where the engineer got their "25% of Largest Continuous Load (LCL)" from. I tried working backwards from the total load amps, but I'm not getting figures that even make sense to me if they're rounded.

Is anybody up to the challenge on a Monday to give me some clue what's going on?

Thanks!

 

[david luchini]

My Esteemed Electrical Friends,

I ran across this panel schedule, and something seemed wrong to me. First off, I'm not used to seeing schedules where they just use L1 and L2. Most panel schedules I have used break up L1 & L2 into 2 columns each so you can
see the exact load being contributed at each circuit breaker.

When I look at this schedule, it seems to me that the BTS pulls 19,000 W and the surge would be pulling 0. Anyhow...

I can't figure out where the engineer got their "25% of Largest Continuous Load (LCL)" from. I tried working backwards from the total load amps, but I'm not getting figures that even make sense to me if they're rounded.

Is anybody up to the challenge on a Monday to give me some clue what's going on?

Thanks!

They figured the BTS and RBS's as continuous load, and the recepts and lights as non-continuous...(27700-1800)*0.25=6475.

It would seem they exceeded the rating of the panel bus.

 

[kingpb]

I guess, other than curiosity, why anyone would want to spend the time trying to figure it out.

If you are in the position of accepting or rejecting this as a submittable document, simple reject it.:thumbsdown:

 

[jcbabb]

My Esteemed Electrical Friends,

I ran across this panel schedule, and something seemed wrong to me. First off, I'm not used to seeing schedules where they just use L1 and L2. Most panel schedules I have used break up L1 & L2 into 2 columns each so you can
see the exact load being contributed at each circuit breaker.

When I look at this schedule, it seems to me that the BTS pulls 19,000 W and the surge would be pulling 0. Anyhow...

I can't figure out where the engineer got their "25% of Largest Continuous Load (LCL)" from. I tried working backwards from the total load amps, but I'm not getting figures that even make sense to me if they're rounded.

Is anybody up to the challenge on a Monday to give me some clue what's going on?

Thanks!

You are correct that the surge protector would be pulling 0, as it is not really a load. However, whoever filled out the schedule did not fill out ANY load for circuits 7-12.

The schedule appears to be setup properly (not sure about the LCL field), but used improperly. As stated above, the total load exceeds the bus rating (even without all of the loads added).