Panel Amps

[donnchadh k 0]

Hi All I have been asked by my boss to work out the max amps on a new panel we are getting.I have all the info on the items in the panel.He wants to know so we can get a mains cable ran in.I do not know if I add all the max amps together or is there another way. Thank you for your time

[OIDMBTRTECH 0]

You definately want to add all of the MAX amps for a total full load rating. That becomes the worst case scenario. Then add 10 to 50% for heat derating. Your local code should be consulted for the exact amount of derating based on length of the cable run.

[k.dougherty 0]

The panel builder already did all those calculations. Why not call them up and ask for the information you require.

[Guest Guest_Bill]

For panels with motor loads you typically take the motor with the largest current draw and multiply it by 125%, then add all of the other motor loads to that for a total (of motors only). Then add in other loads such as transformers, etc.

[Gary.Johnson 0]

This may be oversimplifying but why not check the fuse rating on the main disconnect and add a 50% cushion?

[OIDMBTRTECH 0]

That is great if you actually know the disconnect value.

[Chris Elston 78]

Thanks why I made this spreadsheet. Takes all the guess work out of figuring the entire load on a cabinet. http://forums.mrplc.com/index.php?act=Downl...&CODE=02&id=132