Using SWA armour for earth on a sub-mains supply

[freddo]

Removed as incorrect!

 

[mrloy99]

The calculations showing if the armour has a large enough CSA to be used as the CPC have been done already here.

Is 54g still current?no sign of it in my regs book

 

[freddo]

Pass, it's been so long since I've had to do the calculations!

 

[davesparks]

The calculations showing if the armour has a large enough CSA to be used as the CPC have been done already here.

That table has been proven wrong countless times and yet people still treat it as gospel truth!

 

[freddo]

oh dear!

 

[davesparks]

You can't make a generic table for this as the Figures used in the adiabatic equation are unique to each installation. That table only uses the rule of thumb method which results in an oversized CPC.