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When installing a 'garage cu' adjacent to the main ccu to accomadate an RCD for connecting a TL inverter, what cable size would you use to link the cu's , less than 400mm run
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How & where you intend connecting to the existing install will govern what size cable you will need to use i.e what rating is the overcurrent protection at the point you are connecting to....is it the suppliers fuse or an MCB etc??jWhen installing a 'garage cu' adjacent to the main ccu to accomadate an RCD for connecting a TL inverter, what cable size would you use to link the cu's , less than 400mm run
Fit a Double Pole RCD, as you said on a previous post it is transformless type Invertor so you need a B type RCD.
it a 2.6KWp system. We are doing a ccu change, so was going to put in an isolator switch, its an SMA inverter which according to its specs says a type A RCD, from reading the DTI guide I got the impression that a, you have to oversize the cabling, b) you must keep the ac supply seperate from any other circuits
You can probably miss out the henley; just take both cables from the output of the isolator. The second cable only needs to be 4mm/6mm which is likely to fit in the terminals with a 25mm. It is protected from fault by the DNO fuse (unless the DNO has specified a minimum cross sect area).
The SMA installation instructions do NOT require a rcd. They say if an rcd is required then it must be a minimum of 100mA. And type a rcd is fine for SMA TLs.
Also, as there is only the one device on the circuit, the inverter, then there is no need to protect against overload from the mains side of it, only fault.
Regards
Bruce[/QUOTE
Then they must have another form of separation other than a transformer.
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