Discuss Earth Fault Loop Impedance Test for lighting circuits in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net
yeah, I am not sure it if it necessary to to it. on the GN3 guideline, it has been mentioned the recommended points to be tested are at:i just do R2 on lights
An RCD will not limit the current, but simply provide disconnection where the rated residual operating current (well actually between half and all of the rated residual operating current) is exceeded.it would not let the current reaches to the MCB tripping point.
I agree but the purpose of testing Zs on lighting point and checking the values with Zs of protection device ( MCB in our case) is useless because the RCD will detect and remove the earth fault much quicker than MCB. Means even if the Zs value is higher than values mentioned in the BS7671 Table, the RCD will disconnect the earth fault . Am I wrong?An RCD will not limit the current, but simply provide disconnection where the rated residual operating current (well actually between half and all of the rated residual operating current) is exceeded.
Means even if the Zs value is higher than values mentioned in the BS7671 Table, the RCD will disconnect the earth fault . Am I wrong?
Yes, practicallySo practically, if there is any earth fault, the RCD would detect and remove the fault much quicker than MCB
an RCD is only an additional protection device.
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