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Best location for a SPD

AncientMariner
Our existing supply arrangement is underground TN-S into the DNO's external access meterbox where the Cut-Out, Meter and DNO supplied 2-pole Isolator are located. From the Isolator 25mm tails through the wall to a Proteus metal cased 100 Amp Switch Fuse (Approx 19 x 31 x 6 cm) located where the original meter and CU were located. From the Switch Fuse, a 25mm sub-main of about 10 metres to Hager CU (plastic) in the attached garage.

The above all from when the house was rewired circa 2002.

We seem to have more than our fair share of lamp failures, GU10 Halogens and the GU10 LEDs that I replaced them with - Crompton and B&Q. Also 6-foot LED fluorescent replacements. Add to those, Broadband Routers and VoIP adapters. We are about 150 metres from the sub-station (which supplied underground).

As I see it, the only two locations for a SPD would be either at the Switch Fuse or at the Consumer Unit. I'm assuming that at the Switch Fuse would be preferable. Also, no other earth connection than the existing DNO supplied one from the TN-S supply?


Thanks.  Clive
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    Hah, I am enlightend, I was thinking that on say a supply that has a switchfuse within 3m of the cut out then feeding a CU say up to 10m away from it would be option one to clamp the voltage near the switchfuse for protection of incomming external transients or better still for option two both at the switchfuse and also at the CU  but more cost. You`ve made me rethink now.
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  • 0
    Hah, I am enlightend, I was thinking that on say a supply that has a switchfuse within 3m of the cut out then feeding a CU say up to 10m away from it would be option one to clamp the voltage near the switchfuse for protection of incomming external transients or better still for option two both at the switchfuse and also at the CU  but more cost. You`ve made me rethink now.
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