Pat tester not long passed 6 months need to clarify the Extension lead test

[Richard Revell]

Been a while since I done a PAT test on a 20meter extension cable and kinda forgot how to do it. The calculation I mean.

 

[Richard Burns]

Welcome to the forum

Assuming you are talking about earth resistance, just look up resistances of lengths of cable in the COP and multiply e.g 1.5mm² is 13.3mohms/m so a 20m length would be 13.3*20/1000 = 0.266 ohms
therefore earth resistance should be 0.366 ohms or less.

 

[Richard Revell]

Welcome to the forum

Assuming you are talking about earth resistance, just look up resistances of lengths of cable in the COP and multiply e.g 1.5mm² is 13.3mohms/m so a 20m length would be 13.3*20/1000 = 0.266 ohms
therefore earth resistance should be 0.366 ohms or less.

 

[Dan]

Welcome aboard, thanks for the intro. We've split off Commercial Electricians Talk and Industrial Electricians Talk from the main Electrical Forum. Please take note when you're looking for and posting new threads.