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Where can a PV array be connected?

Chris Pearson

I suspect that a PV array would normally be connected between the meter and the first DB, but can it be connected more peripherally please?

The most suitable area of roof is at the opposite end of the premises from the electrical origin. However, there is a small DB with spare ways adjacent to the loft space. It supplies one lighting and one socket circuit and is seldom significantly loaded. The distribution circuit from the main DB is 16 mm² singles (with the live conductors being sheathed). As far as I can see, it travels through under-floor voids and is boxed in with other services as it ascends in a bathroom so RCD protection is not required. If the inverter can be situated in the loft space then only a short length of AC cable would be required.

This is what I have in mind.

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     (Should they be in the terminal tunnels?)

    Probably not - with some brands, including Wylex, connections can made either in the tunnels or using "fork" connectors under the screw heads ... or both. Fork bus-bars can be quite handy as you can link devices under the screw heads and still have the whole tunnel terminal for connecting cables, that way there are no problems getting both a bus-bar prong and a wire into a single hole and have them both clamped properly.

       - Andy.

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  • 0

     (Should they be in the terminal tunnels?)

    Probably not - with some brands, including Wylex, connections can made either in the tunnels or using "fork" connectors under the screw heads ... or both. Fork bus-bars can be quite handy as you can link devices under the screw heads and still have the whole tunnel terminal for connecting cables, that way there are no problems getting both a bus-bar prong and a wire into a single hole and have them both clamped properly.

       - Andy.

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