[RE-wrenches] conductors and the 120% rule

[Kirk Herander]

Hello,

I have a 225 amp 3-phase main lug sub-panel protected by a 200 amp breaker.
My inverter breaker feeding the sub panel is 60 amps. So 225 a bus x 1.2 =
270 amps. That's less than the sum of the two breakers of 260 amps, so no
issue there. The conductors between sub and main panel have to be rated for
at least 260/1.2 = 217 amps, correct? Is this 217 amps before or after
derating the conductor?

 

 

Kirk Herander

VT Solar, LLC

dba Vermont Solar Engineering

NABCEPTM Certified Inaugural Certificant

NYSERDA-eligible Installer

VT RE Incentive Program Partner

802.863.1202

 

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