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AMD 2. SPDs Shall Be Provided

whjohnson

So, again, where is the evidence that these things are actually guaranteed to 'save' your equipment? After all, if we are now required to 'sell' the concept to the customer, and then rely upon the outcome of their decision we need hard evidence that the things are actually capable of saving that "£4000 television"?

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    Where is the best place to put SPDs? Does one at the origin cover everything?

    Not necessarily - if the distribution circuits are long (>10m) the benefits of can be much reduced. Likewise the benefits of having one in some local DBs but not others or at the origin can be undermined by any cross-connections that by-pass the SPD - c.p.c.s, bonding conductors and extraneous-conductve-parts being one obvious example, data/signal cables being another (e.g. multiroom TV aerial wiring).

    Likewise I reckon main SPDs need to be co-ordinated with those on other metallic services entering the building - phone lines, TV aerials, perhaps PV wiring - otherwise the sensitive equipment in between might actually be worse off if the mains side SPDs pull that side closer to Earth during a spike.

       - Andy.

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  • 0

    Where is the best place to put SPDs? Does one at the origin cover everything?

    Not necessarily - if the distribution circuits are long (>10m) the benefits of can be much reduced. Likewise the benefits of having one in some local DBs but not others or at the origin can be undermined by any cross-connections that by-pass the SPD - c.p.c.s, bonding conductors and extraneous-conductve-parts being one obvious example, data/signal cables being another (e.g. multiroom TV aerial wiring).

    Likewise I reckon main SPDs need to be co-ordinated with those on other metallic services entering the building - phone lines, TV aerials, perhaps PV wiring - otherwise the sensitive equipment in between might actually be worse off if the mains side SPDs pull that side closer to Earth during a spike.

       - Andy.

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