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Loop impedance and RCBO's

Hi Folks,

For some reason I am unable to access the wiring and regulations forumn, so I have decided to throw this questions to the wolves. I have asked this question to a number of people and continue to get conflicting answers

Yes or No. Is the circuit below compliant with BS7671 taking into consideration table 41.3 and table 41.5 of BS7671

2.5mm ring circuit approx 60meters long

Earthing arrangment - TNC-S

Ze - Unknown

Circuit Protective Device - BS EN 61009-1 C32A 30mA RCBO 10k

Measured Zs 1.86ohms

Max allowable Zs within GN3 0.62ohms

Regulation 411.4.9 states that where an RCD has been used to satisfy the requirements of Regulation 411.3.2.2, the maximum values of earth loop impedance (Zs) in Table 41.5 may be applied for non delayed RCDs to BS EN 61009-1

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0 jcm over 8 years ago

This post should really go to the wiring and regulations forum, that’s where all the experts are.

You won’t be able to post until they find out who you are. But there is a bit of a muddle to newcomers, if you select wiring and regulations you will not see Newcomers where you have to post first.
Instead select IET Forums - The IET, there you will see the newcomers forum, your interesting post will let you have access to the main forum after a check.

Regards.
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0 jcm over 8 years ago

This post should really go to the wiring and regulations forum, that’s where all the experts are.

You won’t be able to post until they find out who you are. But there is a bit of a muddle to newcomers, if you select wiring and regulations you will not see Newcomers where you have to post first.
Instead select IET Forums - The IET, there you will see the newcomers forum, your interesting post will let you have access to the main forum after a check.

Regards.
Cancel
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Loop impedance and RCBO's

Instead select IET Forums - The IET, there you will see the newcomers forum, your interesting post will let you have access to the main forum after a check.

Regards.

Instead select IET Forums - The IET, there you will see the newcomers forum, your interesting post will let you have access to the main forum after a check.

Regards.

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