I got a far better price on these ($49.95 ea.) from http://www.texastooltraders.com/Shop/Control/fp/SFV/32723
, they're made by powr-grip, I'm sure they're the same thing mcmaster
is selling.
Ron Young
earthRight - Solareagle.com
On 12-Aug-09, at 1:48 PM, Ron Young wrote:
From: Matt Laffert
When you run long runs of DC conductors with the positive and negative separated by several inches or more, its not "eddy currents" that are a problem as these are generated by AC fields around a wire, its that you are creating a very long "capacitor". Two long copper conductors separated by a lar
Drake Chamberlin wrote:
One question about power factor:
We know it is the ratio of the real power to the apparent power, and
that most utility meters only register real power (watts). Reactive
power doesn't dissipate as heat like power loss through a resistor.
The question is: What is the
Don:
The DC feeder may have an AC component imposed on it by the switching in
the inverter. We installed a large Hawker battery bank
(http://millersolar.com/Portfolio/Commercial/Cal_Trans/cal_trans_gorda.html)
that physically vibrates under heavy charging. We have also seen in this
forum re
Hello Kelly,
I have used GE Silicone RTV-108. Other brands of Room Temperature
Vulcanizing silicone sealants will adhere and seal j-boxes.
Joel Davidson
- Original Message -
From: "Kelly Keilwitz, Whidbey Sun & Wind"
To: "RE Wrenches listserve"
Sent: Wednesday, August 19, 2009 5:2
One question about power factor:
We know it is the ratio of the real power to the apparent power, and
that most utility meters only register real power (watts). Reactive
power doesn't dissipate as heat like power loss through a resistor.
The question is: What is the quantitative effect that
Dave,
Only GEC's are subject to the "continuous" rule (250.64C). It sounds like
your are talking about an EGC tapped from the GEC.
When splicing PV GEC's required under 690.47D, either together (from
separated arrays) or to the existing AC GEC (if close enough), we have been
allowed to use split b
In a message dated 8/19/2009 2:42:48 P.M. Pacific Daylight Time,
davecl...@fsec.ucf.edu writes:
1. Running the positive and negative wires through separate conduit
violates 300.3, and could cause eddy currents in the combiner/disc boxes.
No eddy currents with DC-- But not sure why al
Hi all,
Any recommendations/prohibitions on sealant/glue to reattach a junction box
to the back of a PV module? BP 585, if it makes a difference.
Thanks,
Kelly Keilwitz, P.E.
Whidbey Sun & Wind, LLC
Renewable Energy Systems
NABCEP Certified PV Installer
987 Wanamaker Rd,
Coupeville, WA 98239
PH &
On 8/19/09 15:41 , Dave Click wrote:
Wiring was free air until it got near the disconnect, then the
positive wires entered an open 3' section of FNMC (no strain relief or
box at the other end of the FNMC). The negative wires ran through a
*separate* 3' section of FNMC.
1. Running the positive
Dave,
Do you have any photos? -August
From: re-wrenches-boun...@lists.re-wrenches.org
[re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Dave Click
[davecl...@fsec.ucf.edu]
Sent: Wednesday, August 19, 2009 2:41 PM
To: RE-wrenches
Subject: [RE-wrenc
All,
Couldn't find this anywhere in the archives; sorry if it's a repeat. I
just went out to inspect a ground-mount system that had 3 source
circuits feeding a metal DC combiner/disconnect. Wiring was free air
until it got near the disconnect, then the positive wires entered an
open 3' sectio
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