Wrenches - What is your take on conduit across walkways on commercial
rooftops?
[image: Inline image 1]
The 2012 IFC says The DC combiner boxes shall be located such that conduit
runs are minimized in the pathways between arrays. so that would indicate
that this is acceptable. Is there
We would paint them a bright contrasting color (not blue, red or yellow) and
place ballast blocks on either side as protection.
Sincerely,
Glenn Burt
Sent from my 'smart' phone so please excuse grammar and typos.
-Original Message-
From: Andrew Truitt atru...@gmail.com
Sent:
Wrenches
Some time back there was discussion on the conductor size and efficiency
rating requirement for long DC runs.
What I am looking at is this, 400 feet of MCM 400 to keep the line loss at
or below 1% per NEC code for an off grid application, cost vs return is not
acceptable. 2/0 is less than
Maybe 600vdc charge controller?
Roy Rakobitsch
NABCEP Certified Small Wind Installer®
NABCEP Certified Solar PV Installer®
Certified Advanced Tower Climbing, Safety Rescue
Wind/PV Design Engineer
Windsine LLC
631-514-4166
www.windsine.org
On Jul 22, 2015 1:52 PM, Jerry Shafer
Wrenches,
I've looked and found a few older threads on the topic but thought it is a
good time to refresh our collective info on this as we are getting more
requests to install these (and it is also going to be required by code on
some systems when our province adopts the 2015 Canadian Electrical
Jerry,
2.5% loss is fine, especially considering the cost of reducing that
further.
Remember that you are calculating the line loss at the peak power output of
the array, at noon on a sunny day. Since the array will only provide peak
output for a rather small part of the day (unless you have
Jerry,
A long distance wire run is practical now days using a high voltage controller.
Have a look at Schneider and Morningstar 600Vdc controllers. Not sure what you
mean by nothing can be changed but wire size” but you will have to rewire the
strings into series and protect the wire run.
Andrew,
I’m by no means an expert in this area, but it has come up over and over
again for our commercial and residential installations. There is no
question that a) avoiding conduit in walkways is nearly impossible and b)
it is a trip hazard. I’m not aware of any particular OSHA requirements,
Hi:
Copper conduction losses are proportional to (current) x (current) x
(resistance). For the same wire gauge, double the current means that the
losses increase by 4X.
Going from 150 VDC to 300 VDC will therefore allow you use 4X thinner wire
and going up to 600 VDC will allow you to use
If it is in a walking traffic area of concern, build a short step or steps
over the conduit. Use unistrut and have it sitting (ballasted perhaps so it
won't move) on dura blocks.
Google Cooper B-line They have a line of strut products for just about
everything and you can probably get some
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