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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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    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

    Not sure if the EVSE work in the same way, but with energy monitors the usual setup is to separate the CT from the measured circuit by double/reinforced insulation (e.g. clipping the CT around an insulated & sheathed single core cable) and for the voltage generated by the CT itself to be limited by the burden resistor (often to <<5V for convenient input to an ADC). Thus provided whatever they're connected to (e.g. energy monitor or EVSE control circuitry) provides adequare separation from the mains, they're usually OK in an exposed position.

       - Andy.

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  • 0

    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

    Not sure if the EVSE work in the same way, but with energy monitors the usual setup is to separate the CT from the measured circuit by double/reinforced insulation (e.g. clipping the CT around an insulated & sheathed single core cable) and for the voltage generated by the CT itself to be limited by the burden resistor (often to <<5V for convenient input to an ADC). Thus provided whatever they're connected to (e.g. energy monitor or EVSE control circuitry) provides adequare separation from the mains, they're usually OK in an exposed position.

       - Andy.

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