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 .
