To: RE-wrenches
Subject: Re: [RE-wrenches] conductors and the 120% rule
A very clarifying change is what I'd call it!
First off, rather than being based on the actual breaker size on the
inverter output circuit, calcs are instead based on 125% of the inverter
rated output current.
705.12
:* Tuesday, March 04, 2014 4:32 PM
*To:* RE-wrenches
*Subject:* Re: [RE-wrenches] conductors and the 120% rule
what inverter(s) are you using?In many cases the Neutral is not
considered a Current Carying Conductor by the Manufacturer and therefore
you only have 3 CCC.
*Al Frishman
*Sent:* Tuesday, March 04, 2014 4:32 PM
*To:* RE-wrenches
*Subject:* Re: [RE-wrenches] conductors and the 120% rule
what inverter(s) are you using?In many cases the Neutral is not
considered a Current Carying Conductor by the Manufacturer and therefore
you only have 3 CCC.
*Al
, 2014 4:05 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] conductors and the 120% rule
What is the length of the conduit to the subpanel? That will determine
whether to apply the derates.
R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar
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
The conductors have to be rated for 200A as normal. Fault current can only
come from the grid.
While the total available current on the bus of a panel is the total of the
source breakers, in the conductors, grid and solar power cancel out and the
total is not the sum of the two.
On Tue, Mar 4,
Both the bus and conductors need to be rated for 217 amps minimum. As you
mentioned, the bus is not a problem. The way I interpret it, the conductor
size required would be after derate factors are applied. The rating of the
conductor is ultimately dependent on the derate factors.
If you can
: Re: [RE-wrenches] conductors and the 120% rule
Both the bus and conductors need to be rated for 217 amps minimum. As you
mentioned, the bus is not a problem. The way I interpret it, the conductor
size required would be after derate factors are applied. The rating of the
conductor is ultimately
Sent: Tuesday, March 04, 2014 2:57 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] conductors and the 120%
rule
Both
the bus and conductors need to be rated for 217 amps
minimum. As you
, March 04, 2014 2:57 PM
*To:* RE-wrenches
*Subject:* Re: [RE-wrenches] conductors and the 120% rule
Both the bus and conductors need to be rated for 217 amps minimum. As you
mentioned, the bus is not a problem. The way I interpret it, the conductor
size required would be after derate factors
-wrenches.org] On Behalf Of Ray Walters
Sent: Tuesday, March 04, 2014 4:05 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] conductors and the 120% rule
What is the length of the conduit to the subpanel? That will determine
whether to apply the derates.
R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified
Subject: Re: [RE-wrenches] conductors and the 120% rule
Yeah, I assumed you meant the four conductors. The exception would solve
your problem if it's physically possible.
How long of a run are we talking about? The cost difference shouldn't be bad
for a short distance.
Jason Szumlansk
i
-wrenches.org] On Behalf Of Ray Walters
Sent: Tuesday, March 04, 2014 4:05 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] conductors and the 120% rule
What is the length of the conduit to the subpanel? That will determine
whether to apply the derates.
R.Ray Walters
CTO, Solarray, Inc
Nabcep
...@lists.re-wrenches.org] On Behalf Of Allen Frishman
Sent: Tuesday, March 04, 2014 4:32 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] conductors and the 120% rule
what inverter(s) are you using?In many cases the Neutral is not
considered a Current Carying Conductor by the Manufacturer
...@lists.re-wrenches.org] On Behalf Of Allen
Frishman
Sent: Tuesday, March 04, 2014 4:32 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] conductors and the 120% rule
what inverter(s) are you using?In many cases the Neutral is not
considered a Current Carying Conductor by the Manufacturer
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