Determine feeder size in the site survey

[David Christian]

I work in an consulting firm in CA. As I need to go to site survey for some tenant improvement projects, I found sometimes it is really hard to know the panel size because the old panel does not show any brand and size.

Therefore, I have to determine the panel size from the feeder size.

For example, if the feeder size is #1 AWG, the panel size is probably 100 Amps.

Therefore, I need your advice that how to determine the feeder size.

PE in my company just suggest me to use a A3 paper to mark the Perimeter of the feeder. Is there any other suggestion?

Thanks for all your advice!

 

[ron]

If it isn't printed on the conductor insulation, we use a non-metallic caliper to determine diameter.