Page 1 of 1

Europa Plus Earth Bond Resistance Calculator

PostPosted: Tue May 01, 2012 2:52 pm
by kryten
Does anyone know why the values generated by the built-in Earth Bond Resistance Calculator on the Europa Plus are so much larger than the nominal resistance of the conductors as taken from widely published tables?
For example:
1mm CSA (10A) 3M nominal resistance 0.0585 Ohms - Seward Calc 0.16 Ohms
1mm CSA (10A) 6M nominal resistance 0.1170 Ohms - Seward Calc 0.22 Ohms
1mm CSA (10A) 12M nominal resistance 0.2340 Ohms - Seward Calc 0.34 Ohms

I know there needs to be a margin added for contact resistance in the plugs, but isn't ths going a bit far?

Re: Europa Plus Earth Bond Resistance Calculator

PostPosted: Tue May 01, 2012 4:14 pm
by safe + sound
Hi kryten

This is because the Code of Practice states the pass level for supply cords, cord sets and extension leads is (0.1 + R) where R is the resistance of the protective conductor, ie. the nominal resistance you refer to.

Re: Europa Plus Earth Bond Resistance Calculator

PostPosted: Tue May 01, 2012 5:40 pm
by kryten
Thanks safe + sound, it makes sense now! :D