Quick Question - Max Permitted Zs Values | on ElectriciansForums

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byrnie_2004

On an Installation Cert in the 'Max Permitted Zs' column should i put the tabulated values in the regs or should i put the corrected values(x0.8 rule of thumb)????
My guess would be corrected values as that would be max zs at ambient temperature at the time of test?
Cheers peeps,

Dan:cool:
 
As I understand it, you are expected to put in the uncorrected tabulated values from BS7671.
If thes are NICEIC or Napit forms, I believe you are also expected to put in the uncorrected measured values.
Bit weird, but that's the scheme providers for you.
 
general opinion is to enter the brb ( uncorrected ) figures on the test sheet, but the readings you get should be below the corrected figures. very rare to see cables reaching max. temp. of 70 deg. anyway
 
but if it's a TT system with RCD protection, you can enter 1667.

Just on TT systems, or on any system so long as the circuit concerned is protected by a 30mA RCD?

PS should that be 1667 so long as the rcd is rated to trip at 30mA?

PPS these are both questions, not statements.
 

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