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BMU cables - must they be trunked


Bobster.

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Some of you may recall that I had a problem with my batteries shutting down which was solved by the installation of a 2nd BMU and a cable between BMU and inverter.

This initially didn't work. It turned out that the cable had to be modified. I did a temporary fix myself after the installer had told me which connections to cut. I left that cable simply hanging down from the inverter and and running into the open back of the battery cabinet.

The installer then came to tidy up, left the original cable in place and rerouted mine so that it now goes through the wrong hole in the bottom of the Goodwe (IE it is now mislabelled) and also is trunked as far as possible until it tumbles out of the end of the trunking and then takes a more circuitous route (untrunked) into the battery cabinet.

Now I want to tidy this up myself, but I am wondering why it was done in this way. Is there a requirement that what is really a network cable, not carrying any kind of dangerous current, be trunked?

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On 2020/01/16 at 5:46 AM, Bobster said:

Is there a requirement that what is really a network cable, not carrying any kind of dangerous current, be trunked?

I don't think it is a requirement. It will however make your installation look more professional and prevent accidental damage/dislocation of the cable

 

On 2020/01/16 at 5:46 AM, Bobster said:

left the original cable in place

Why?

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1 hour ago, Fuenkli said:

I don't think it is a requirement. It will however make your installation look more professional and prevent accidental damage/dislocation of the cable

I agree with this, it is also good practice to keep network cables at least 150mm away from power cables, for possible interference. It is just good practice to fit some sort of trunking, I like to use a small pvc sprag tube or the pvc coil rap around type, and than neatly cable tied somewhere so it can’t be accidentally hooked.

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On 2020/01/16 at 5:46 AM, Bobster said:

left the original cable in place

 

Quote

Why?

I don't know. Neither end is connected to anything, and the original cable goes into the BMS connector on the inverter whilst the current, actual BMS connector is fed through a connector that is labeled DRED. So it's confusing.

 

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