Zs too high

Discuss Zs too high in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net

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chris_k

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Hi
After completing a 2 exta sockets in another kitchen, im finding the zs is on the limit. well just over. Zs - 1.06 (0.91 per OSG)

I know the rcd helps with disconnection times but what would be my best option to bring this within limits, additional earthing to cu?

The system is TNCS, with one ring supplying the whole house. CU is Older wylex with NB30 mcb`s. Ive installed a separate RCD unit next to cu for protection
PFC - 0.22

Thanks
 

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