BS3871

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I think you will find they are in the On Site Guide or Guidance Notes 3 CJS

 
if you have a NICEIC cert book they are inside the front cover.

if you need them now let me know, otherwise I'll have a look tomorrow for you.

PM me if you need

 
They've been dropped from the regs as of 17th. they were in 16th if you have a copy.
The 16th is based on 240 volts the 17th is 20 volts that is why the max Zs has changed therefore you need to max current In for type 1,2,3 or 4 (as in NozSparks post) by 230 to obtain the Zs:Salute

 
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