Help!
Hi Guys,
can anyone shed any light on a query regards the max. ELZ for a 30mA RCD protected circuit?
Reg. 413-02-16 states that the max. ELZ for a 30mA RCD should be 50V/0.03 mA = 1666 ohms.
I have a ring main protected by a 32A/32mA RCBO (ie an MCB/RCD combination)
Table 41B2 lists the max. ELZ as 1.5ohms (for a type B).
Why is the Regs. differentiating between an RCBO (1.5ohms) and an RCD (1666ohm) and say a 32A type B MCB combination.
(Bearing in mind you may not be able to achieve a ELZ of 1.5ohms on a TT system, when you may want to use an RCD/MCB combination)
Or have I got my K in a twist!!
Thanks Guys
magicman
Hi Guys,
can anyone shed any light on a query regards the max. ELZ for a 30mA RCD protected circuit?
Reg. 413-02-16 states that the max. ELZ for a 30mA RCD should be 50V/0.03 mA = 1666 ohms.
I have a ring main protected by a 32A/32mA RCBO (ie an MCB/RCD combination)
Table 41B2 lists the max. ELZ as 1.5ohms (for a type B).
Why is the Regs. differentiating between an RCBO (1.5ohms) and an RCD (1666ohm) and say a 32A type B MCB combination.
(Bearing in mind you may not be able to achieve a ELZ of 1.5ohms on a TT system, when you may want to use an RCD/MCB combination)
Or have I got my K in a twist!!
Thanks Guys
magicman