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CT Clamp connections inside consumer units

Alan B

I am looking at how best to terminate EV ultra cable for a EV charger at the consumer unit end.

The data cable for EV ultra has insulation rated at the same voltage as the power cables and therefore can be run inside the consumer unit. If there is space it would be quite tidy to actually mount the CT clamp inside the consumer unit as well. 

I have seen some on you tube do this with some heat shrink to give extra protection and wagos to make connection between the EV ultra and the CT clamp cable. I would probably go for a crimp connector as myenergie at least seem to feel spring connectors are unreliable for data.

 

Just wondering if others view this as an acceptable/good solution

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    This depends on whether the output of the CT is “data” or “current”.

    For “current” types, if the cables on the CT itself are only single insulated, it's not usually safe for them to be outside an enclosure anyway … the output of most CTs is NOT SELV or PELV, but at best FELV.  So, as Lyle and Mike say, in a box is the best option. You can get hold of “guaranteed SELV” CTs, but they are very expensive.

    Data cables should ideally be installed in accordance with BS 6701, and physical separation of at least 50 mm between power and data is required, even with an earthed metallic “divider”. (Which is why I'm not, personally, 100 % convinced at the moment that a combined power/data cable meets BS 7671, by virtue of the fact it doesn't appear to meet BS 6701. Importantly, the physical separation is classed in BS 6701 as an "essential requirement for safety".)

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    This depends on whether the output of the CT is “data” or “current”.

    For “current” types, if the cables on the CT itself are only single insulated, it's not usually safe for them to be outside an enclosure anyway … the output of most CTs is NOT SELV or PELV, but at best FELV.  So, as Lyle and Mike say, in a box is the best option. You can get hold of “guaranteed SELV” CTs, but they are very expensive.

    Data cables should ideally be installed in accordance with BS 6701, and physical separation of at least 50 mm between power and data is required, even with an earthed metallic “divider”. (Which is why I'm not, personally, 100 % convinced at the moment that a combined power/data cable meets BS 7671, by virtue of the fact it doesn't appear to meet BS 6701. Importantly, the physical separation is classed in BS 6701 as an "essential requirement for safety".)

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