[RE-wrenches] cable spacing in trenches

[bob ellison]

What are you running for combiner boxes and wire to run at 1000 volts?

Seems that I remember that fuses are only good for 600 volts and most boxes the same limit? 

What are you using?

 

Just wondering,

Bob Ellison 

 

From: re-wrenches-bounces at lists.re-wrenches.org [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Jerry Caldwell
Sent: Thursday, November 03, 2011 5:42 PM
To: RE-wrenches
Subject: [RE-wrenches] cable spacing in trenches

 

Can anyone direct me to the NEC article that stipulates how many inches of separation must be between cables operating at different voltages?

 

I have a project with PV combiner box home runs at 1,000 volts DC in the same trench with 12.47 kV cables.  Table 300.5 shows minimum cover requirements for direct burial cables, but this is the distance beneath grade the cables must be.  Is there anywhere in the code that calls for a minimum separation distance between cables at different voltages?

 

Thanks,

Jerry Caldwell

 

 

 

  _____  

From: Marco Mangelsdorf <marco at pvthawaii.com>
To: 'RE-wrenches' <re-wrenches at lists.re-wrenches.org>
Sent: Thursday, November 3, 2011 2:27 PM
Subject: [RE-wrenches] under performing Enphase inverters

For the first time, several weeks ago, after 40-50 Enphase installs, we’ve come across at least two M210s that we putting out consistently lower outputs than their immediate neighbors.

 

We replaced the two mods first, which made no difference.  Then, in consultation with Enphase, replaced the M210s.  After replacing them, the power output was as it should be.

 

Now I’ve got another suspect system with several underperforming mods out of (36).

 

Has anyone else had this experience?

 

Thanks,

marco

 


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