Adding ELCI switch to existing panel - SailNet Community
 
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post #1 of 2 Old 07-21-2017 Thread Starter
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Adding ELCI switch to existing panel

I have an existing Blue Seas 8408 Panel that I would like to replace the existing AC switch with an ELCI version. The existing switch has multiple connections to the Load side of the switch which I think should go through the ELCI 'ring' - on the hot side they are AC bus, panel digital multi-function meter and panel light. On the neutral side there are 2 connections panel light and neutral bus.

Looking at the wiring diagram for a different Blue Seas panel that has ELCI already suggests that the panel LED light doesn't need to go through the ELCI ring - presumably because it is such a low draw? However I suspect the digital meter is a different story.

I can't think of any reason not to move the monitor wire to the AC hot bus, but then I can't imagine why they didn't do it in the first place except maybe to save a couple of inches of wire. So my question is - am I missing something? is there a good reason to have the monitor directly on the AC main switch?

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post #2 of 2 Old 07-22-2017
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Re: Adding ELCI switch to existing panel

Quote:
Originally Posted by reduc View Post
I have an existing Blue Seas 8408 Panel that I would like to replace the existing AC switch with an ELCI version. The existing switch has multiple connections to the Load side of the switch which I think should go through the ELCI 'ring' - on the hot side they are AC bus, panel digital multi-function meter and panel light. On the neutral side there are 2 connections panel light and neutral bus.

Looking at the wiring diagram for a different Blue Seas panel that has ELCI already suggests that the panel LED light doesn't need to go through the ELCI ring - presumably because it is such a low draw? However I suspect the digital meter is a different story.

I can't think of any reason not to move the monitor wire to the AC hot bus, but then I can't imagine why they didn't do it in the first place except maybe to save a couple of inches of wire. So my question is - am I missing something? is there a good reason to have the monitor directly on the AC main switch?
I just put an ELCI on my boat. However, I'm no expert, but this is my understanding of how the ELCI operates. Basically as long as the current flowing through the hot wire is equal to that on the neutral, the ELCI does nothing. Only if there is an imbalance does it trip. That means that the current is finding its way back to ground through a different route (possibly through the water).

So, as far as the panel LED, it has less to do with draw and more to do with the fact that it must make a complete circuit on the shore power side of the ELCI. You could have anything 'up stream' from the ELCI as long as the compete circuit for the item is up stream from the ELCI. Of course, that also begins to defeat the purpose of the ELCI to begin with.
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