Re: [RE-wrenches] conductors and the 120% rule

2014-03-06 Thread Kirk Herander
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

Re: [RE-wrenches] conductors and the 120% rule

2014-03-05 Thread Brian Mehalic
:* 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

Re: [RE-wrenches] conductors and the 120% rule

2014-03-05 Thread Jason Szumlanski
*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

Re: [RE-wrenches] conductors and the 120% rule

2014-03-05 Thread William Korthof
, 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

[RE-wrenches] conductors and the 120% rule

2014-03-04 Thread 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

Re: [RE-wrenches] conductors and the 120% rule

2014-03-04 Thread Chris Mason
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,

Re: [RE-wrenches] conductors and the 120% rule

2014-03-04 Thread Jason Szumlanski
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

2014-03-04 Thread Kirk Herander
: 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

Re: [RE-wrenches] conductors and the 120% rule

2014-03-04 Thread Ray Walters
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

Re: [RE-wrenches] conductors and the 120% rule

2014-03-04 Thread Jason Szumlanski
, 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

Re: [RE-wrenches] conductors and the 120% rule

2014-03-04 Thread Kirk Herander
-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

Re: [RE-wrenches] conductors and the 120% rule

2014-03-04 Thread Kirk Herander
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

Re: [RE-wrenches] conductors and the 120% rule

2014-03-04 Thread Allen Frishman
-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

Re: [RE-wrenches] conductors and the 120% rule

2014-03-04 Thread Brian Mehalic
...@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

Re: [RE-wrenches] conductors and the 120% rule

2014-03-04 Thread Kirk
...@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