Multiplus-II and grounding best practices

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zeron asked Jan 22, '23

Multiplus-II and grounding best practices

I'm using a Multiplus-II 5000 at home and want to make sure that the grounding setup is correct.

AC-in is connected to the grid (which only provides phase/neutral so I connected the PE line directly to the house's ground, as well as the chassis)

AC Out 1, until now, is my whole electrical network so it remained connected to the house's ground without any changes.

I want to add new equipment on AC Out 2 and I'm wondering how I should ground that new line. Should I connect it to the AC Out 2's PE line? Directly to the house's ground with AC-in/chassis/... ? Are all the grounds inside the multiplus connected together in which case it doesn't matter where I connect it?

Multiplus-II Grounding

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delf67 answered · Jan 22, 2023 at 09:02 PM

On the Multiplus 1 the AC in PE, AC Out PE and chassis are all bonded internally, so I'd assume AC Out 2 would be too on the Mp2. It would be unsafe to have it otherwise. Check for continuity with a multimeter to confirm.

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zeron commented · Jan 23, 2023 at 12:10 AM

Doing a continuity test is an easy and definitive answer indeed, thanks for the idea!

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Answer 1 · 2023-01-23T17:13:29Z

sharpener answered · Jan 23, 2023 at 05:13 PM

The 5k MP II definitely has all the ground connections tied together. So you should not connect the house ground to the system in more than one place.

You do not say what the "house ground" consists of. Do you have a proper earth spike? On an ESS in the UK this should have a resistance of less than 200 ohms, in addition to any grid-supplied earth ("Which in our case we have not got")

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