Discuss Max Zs @ 80% TN-C-S System in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

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Morning all,

I'm currently finishing off my Lvl 3 C+G and I just need to finish off my design spreadsheet then I'll have completed it. I've one last column to fill in "Max Zs @80%" the design is based on a hotel using a TN-C-S supply. I'm just wanting to know where I can find this information in the On Site Guide.

Thanks
 
You can use the values from Tables 41.2 to 41.4 in BS7671. Just calculate the 80% value from those.
 
The values in the OSG for max Zs are already adjusted. As Westy said regards BS7671 you have to multiply those by 0.8
 

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