Discuss Maximum Zs values for BS3871 in the Electrician Courses : Electrical Quals area at ElectriciansForums.net

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gazdkw82

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Where can I find the max Z's value for a BS3871, type 3, 32A MCB?

Iv had a look through BS7671 and done some searching online but I cannot find it. IV found some tables with listed Zs values for a 3871 but I have no idea where they originate from or how old
 
You would need to look in a 16th Ed to find them as I said they were the same Table as a type C.
 
It's not required. It asks for the max Zs values listed in BS7671.
But the tables for BS3871 are not listed within BS7671 which already have Cmin applied as of the 17th Amdt 3.

So to ensure the circuit complies with current regulations you would have to apply Cmin and then 80% to take into account thermal compensation.

How is Cmin applicable to any works you carry out on an existing circuit?
 
But the tables for BS3871 are not listed within BS7671 which already have Cmin applied as of the 17th Amdt 3.

So to ensure the circuit complies with current regulations you would have to apply Cmin and then 80% to take into account thermal compensation.

How is Cmin applicable to any works you carry out on an existing circuit?

Bs7671 does not have the rule of thumb applied. Onsite guide does. The minor works is asking for values from BS7671, therefore it's asking for values without the rule of thumb applied.
 
Bs7671 does not have the rule of thumb applied. Onsite guide does. The minor works is asking for values from BS7671, therefore it's asking for values without the rule of thumb applied.
I'm not talking about the rule of thumb, I'm talking about Cmin.
 

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