<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">I have seen these conduit boxes torch off, like to see and have in free air. Supporting battery cable makes more sense then the hassle of installing this is a LB.<div class="">T<br class=""><div class=""><div><blockquote type="cite" class=""><div class="">On Apr 27, 2017, at 7:41 PM, Jerry Shafer <<a href="mailto:jerrysgarage01@gmail.com" class="">jerrysgarage01@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><div class="">Wrenches</div><div class="">In the event you or some else installed a Class T fuse and you want to protect it a little more from cable stress, installing it inside a PVC C conduit body and cover and fastening the cables to the fuse inside that, this will protect the fuse from stress and metallic contact and you can put a label on it stating size and type. </div><div class="">Jerry</div></div><div class="gmail_extra"><br class=""><div class="gmail_quote">On Wed, Apr 26, 2017 at 6:05 PM, Matthew Sirum <span dir="ltr" class=""><<a href="mailto:matthewsirum@gmail.com" target="_blank" class="">matthewsirum@gmail.com</a>></span> wrote:<br class=""><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Greetings William,<br class="">
<br class="">
Good point. This is something I always take into consideration. I<br class="">
have used Class T Fuses in many situations with and without their fuse<br class="">
holders. In the case of the installation shown in my custom DC Bus<br class="">
System pictures the wire/cable type and wire management avoid putting<br class="">
too much physical stress on the Class T Fuses. The #4 AWG conductors<br class="">
are supported from above and apply very little stress on the fuses<br class="">
they connect to. The 4/0 AWG cabling is Cobra X-Flex (fine stand,<br class="">
very flexible) and each of these conductors is secured a few inches<br class="">
from where they connect to their fuses. Care was taken in making up<br class="">
these connection and they were all carefully adjusted and inspected to<br class="">
ensure they would not stress the fuses. I feel really good about how<br class="">
it all came together. The same care and attention will be needed<br class="">
whenever these connections are serviced and the fasteners are<br class="">
torqued/tightened. When well planned and carefully assembled I do not<br class="">
have concern there will be any issues related to not using the fuse<br class="">
holder. I also think about this another way as well... Using the<br class="">
Class T Fuse Holder adds another 2 connections to the circuit. I try<br class="">
to remind myself that more connections can equal more chance of<br class="">
issues... Although, if a manufacturer of a Class T Fuse states the<br class="">
fuse holder must be used with their fuse there could be an NEC<br class="">
violation by not using it.<br class="">
<br class="">
One thing to note about the use of these fuses in this installation is<br class="">
that they are supplemental over current protection (OCP). Each<br class="">
positive (ungrounded) conductor connecting to this DC Bus System has a<br class="">
means of primary over current protection and disconnect on its<br class="">
opposite end. The battery systems, the charge controllers, and the<br class="">
inverter/chargers all have circuit breaker disconnects on their<br class="">
respective positive circuit conductors connecting to this DC Bus<br class="">
System. I have seen other folks build without having the needed<br class="">
appropriate means of disconnect and OCP; although most folk are<br class="">
probably more likely to include the primary OCP, but not consider the<br class="">
supplemental OCP. The supplemental OCP (Class T Fuses) provide<br class="">
protection in the event of a fault or short in a circuit between the<br class="">
Bus System and the other OCP at the other equipment.<br class="">
<br class="">
Like many folks I have installed and worked on battery systems where<br class="">
we install a Class T Fuse directly onto the positive terminal of the<br class="">
battery bank or via some form of busbar or connector etc. In these<br class="">
cases not only do we need to take care not to stress the fuse, but the<br class="">
fuse itself (and added busbar/connector etc) can act like a lever and<br class="">
along with the mating cable lug(s) create too much stress on the<br class="">
battery terminal... Potentially damaging the terminal, the inner<br class="">
battery connection to the terminal, and/or the seal between the<br class="">
battery case and the terminal. Carelessly tightening the<br class="">
hardware/fasteners to assemble these items to the battery terminal is<br class="">
a common way of inflicting damage on the battery as well. I know I<br class="">
have been involved in some service situations where there was more<br class="">
stress on the Class T Fuse than I would like to see, but as best I<br class="">
know there have not been any fuse failures because of it.<br class="">
<br class="">
Thanks for bringing up this question!<br class="">
<br class="">
Best regards,<br class="">
<br class="">
----MATT<br class="">
<br class="">
Matthew Sirum<br class="">
P.O. Box 1227<br class="">
Greenfield, MA 01302-1227 USA<br class="">
phone: <a href="tel:%2B1.413.773.0611" value="+14137730611" class="">+1.413.773.0611</a><br class="">
email: <a href="mailto:MatthewSirum@gmail.com" class="">MatthewSirum@gmail.com</a><br class="">
<br class="">
<br class="">
-------- Original Message Below --------<br class="">
<br class="">
[RE-wrenches] Third Radian<br class="">
<br class="">
William Miller william at <a href="http://millersolar.com/" target="_blank" rel="noreferrer" class="">millersolar.com</a><br class="">
Tue Apr 25 23:03:03 PDT 2017<br class="">
<br class="">
Matt:<br class="">
<br class="">
I have a question for you: I have often considered mounting Class T fuses<br class="">
directly to a bus bar as you have done. Are you ever worried about physical<br class="">
strain on the fuse itself without a fuse holder?<br class="">
<br class="">
Thanks again for all of your input.<br class="">
<br class="">
William Miller<br class="">
<br class="">
Lic 773985<br class="">
<a href="http://millersolar.com/" target="_blank" rel="noreferrer" class="">millersolar.com</a><br class="">
<a href="tel:805-438-5600" value="+18054385600" class="">805-438-5600</a><br class="">
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