Re: cable amp ratings - answers to wrong questions

["Joe Smalley" <joes@worldfront.com>]

I miss typed that and did not catch it in proofreading. Sorry.

I heard this rule from a plant engineer when I was installing some chargers
in a Government building. We looked it up and found that it was 80%. He
would not let me plug the charger into the 20 amp outlet that was provided
according the equipment manufacturer's requirements. It was pluggable
equipment but he insisted that I needed a 30 amp 3 phase 208 circuit to run
a Sorensen DCS-55-55. http://www.sorensen.com/products/docs/DCS.pdf

The chart on page 3 shows that it can draw 14 amps. Three days later, he
allowed me to install the chargers on the existing 20 amp circuits.

It is good to see others find my mistakes. It lets me know that someone is
reading my posts and cares enough about the truth to speak up and say
something when something is wrong.

Joe Smalley
Rural Kitsap County WA
Fiesta 48 volts
NEDRA 48 volt street conversion record holder
joes@worldfront.com



> BTW, I've never heard of Joe's "75 percent rule."  However, there is a
code
> requirement that permanently connected equipment can't create a sustained
> load in excess of 80% of the circuit's rated capacity (16 amps on a 20 amp
> circuit).