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239-1 questions

Discuss 239-1 questions in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net

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vbyrne

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Lads I have a question that I am not sure about


Why does a calculated result work out much greater than the actual measured result?

Why are type D breakers utilised on certain circuits
 
if you are referring to Zs readings. the measured figures are generally lower due to parallel paths through the gas/water bonding. and type C and D breakers are used where the switch-on current is excessively high.... transformers, motors etc,
 

Reply to 239-1 questions in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net

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