Sanity Check

[George Stolz]

On a panel schedule, how is a load to be represented? For example, let's say I have a single phase 1000W 208V load on circuits 1 & 3. Should the load calculation show

500W on 1 and 500W on 3, or
1000W on 1 and 1000W on 3 ?

Sorry if this is a super basic question, but it has me questioning my sanity.

Thanks,
George

 

[cadpoint]

http://www.raritan.com/blog/detail/how-to-calculate-current-on-a-3-phase-208v-rack-pdu-power-strip

It's a downloadable chart that should answer your question, but I don't know, but it seems to fit the orginal ?

 

[Smart $]

For line-to-neutral loads, all the power (or volt-amperes) goes on one leg.
For line-to-line loads, half the power (or volt-amperes) goes on each leg.
For 3-phase loads, one-third the power (or volt-amperes) goes on each leg.

If in the future one needs another sanity check, just remember that the sum total (sum of the sums of each leg) should reflect the actual connected load... not double or triple of some loads.

 

[George Stolz]

Thanks Smart. I doubt a future reminder will be necessary, as I exposed my ignorance in grand fashion and the sting to my pride should leave a lasting impression, which is a good thing.

The way it finally appeared in a vision for me was that according to the load calculation, I have a 104V 500W load on one leg, in series with a 104V 500W load on the other leg, which adds up to one 208V 1000W load.