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is a surge protected extension/powerstrip any use without upfront SPDs

psychicwarrior

hello goodly morrow

If a T3 SPD, 'must not' be used, as per 7671,  without upfront (T1+)T2 SPD  (for want of better words) ,  what real value is a plugged in surge protected extension lead/powerstrip  (which is a T3 in effect one presumes) without a T2 somewhere upfront ?

Or is it really just a sacrificial item and really is better to have.

Perhaps the components are pretty useless and cheap in most of the consumer grade surge leads/strips.  May be connected devices (via power blocks and transformers etc) can cope just as well  ;-)

Engineering references and regs are not going to use the anything is better than nothing finger in the air style and have to present a considered, tested and  co-ordinated approach. The consumer market takes a different view it seems and makes little to no effort (does it) to advise that surge protected powerstrips/leads 'must not be used' without upfront SPD,  but if course such is not part of fixed wiring any way so no need, or is there a need . 

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    None of the data sheets I can find seem to classify them as T3 or anything else nor mention any need for an upstream T2 (just a mention that they won't protect against lightning - usually a job for T1s)  - given most seem to come with some kind of free insurance (often £1000 - i.e. significantly more than the sale price) the manufacturers must have some confidence in them. If I were designing such a product I think I'd make it T2+T3 type (or loose equivalent) to make sure I wasn't swamped with claims.

       - Andy.

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    None of the data sheets I can find seem to classify them as T3 or anything else nor mention any need for an upstream T2 (just a mention that they won't protect against lightning - usually a job for T1s)  - given most seem to come with some kind of free insurance (often £1000 - i.e. significantly more than the sale price) the manufacturers must have some confidence in them. If I were designing such a product I think I'd make it T2+T3 type (or loose equivalent) to make sure I wasn't swamped with claims.

       - Andy.

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