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Old 04-15-2015, 06:08 PM   #1
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Another EMS HW30C Install thread

Hello,

I know there are several threads about installing the EMS power manager but I had some specific questions about my set up. See the attached pictures for reference.

First, rather than disconnecting the incoming AC line from the power panel, can I just cut it and splice the EMS inline? Is there any reason not to do that?

I'm thinking that I might put the EMS in the "cable bay" which is right next to the power panel rather than behind the power panel. I would put a couple of strain reliefs on the cable of course - so I don't yank it out of the EMS when hooking up to the pedestal.

I'm also thinking I should add a battery disconnect on the DC side. As far as I can tell, there is not one anywhere. To disconnect DC power, I have to pull the cable off the battery. Again, can I just cut the red wire behind the panel and splice the disconnect switch in there and mount it to the wall by the panel?

What do you recommend for a disconnect switch?

I think I have a pretty good handle on this but i just wanted to run this by the experts to make sure I'm not overlooking something.

Thanks
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Old 04-15-2015, 10:13 PM   #2
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Experts? He called us what!

Thats a good question, I hard wired mine by splicing the 10 gauge wire coming into trailer. Im sure another member will chime in and have probley already have done this but Im not sure with your set up having different power supply cord than mine.

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Old 04-15-2015, 10:43 PM   #3
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The instructions from PI suggest that you cut the existing power supply and fit each end into the EMS unit. Depending on where you wish to locate the unit you may not have enough cable length for this to be possible. If so connect the power center end to one side and buy a suitable length to run from the other side of the EMS to the power center.

As far as your 12V DC disconnect switch...most are located close to the battery before any other wiring.

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Old 04-16-2015, 12:02 AM   #4
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I bought a couple of feet of 10-2. I disconnected the incoming line at the panel, connected that to the line side on the EMS, connected one end of my new wire to the load side of the EMS, and connected the other end to the line side at the panel. That gave me plenty of slack to work with. If I want to take it out if ever selling my trailer, I just connect the original feed line back to the panel.

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Old 04-16-2015, 08:21 AM   #5
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Quote:
Originally Posted by chriscowles View Post
I bought a couple of feet of 10-2. I disconnected the incoming line at the panel, connected that to the line side on the EMS, connected one end of my new wire to the load side of the EMS, and connected the other end to the line side at the panel. That gave me plenty of slack to work with. If I want to take it out if ever selling my trailer, I just connect the original feed line back to the panel.

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10-2?? Aren't you missing a wire? Black, White, Green?
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Old 04-16-2015, 09:54 AM   #6
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10-2 wire includes a ground wire. There are actually three wires inside. 10-3 wire would have three primary wires and a ground for a total of four wires.
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Old 04-16-2015, 09:58 AM   #7
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I pulled the in coming line going into distribution panel out and ran it to incoming side of ems then run the new wire from outgoing side of ems back to the distribution panel.

That way you can work on ems outside of cabinet.
Then when done put it behind distribution panel.

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Old 04-16-2015, 09:00 PM   #8
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10-2 wire includes a ground wire. There are actually three wires inside. 10-3 wire would have three primary wires and a ground for a total of four wires.
I was assuming he went with SOW or SJOW (stranded conductors).. If he used romex (house wire - solid conductors) then I get the 10-2... With SOW and SJOW 10-2 would not have included the ground wire...
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Old 04-16-2015, 10:18 PM   #9
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I was assuming he went with SOW or SJOW (stranded conductors).
I used Romex, the same as used by FR.



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Old 04-18-2015, 01:19 PM   #10
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Okay, so I like the idea of pulling the power cable from the panel rather than cutting the cable but...

I can't get the cable out of the panel. In the picture, you can see there is a gray strain relief doohickey holding the cable into the back of the panel. There is what looks like a blade that has been pushed down to pinch the cable so it doesn't pull out. How do I release the blade?

I've tried pulling up on it but it doesn't seem to want to budge and I don't want to break it (much). It seems like for this to work, the blade won't want to back out but how do you release it when you want to?

Thanks
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