Hi all,

 

What are the regulations when it comes to selecting a suitable size for your earth conductor in a single phase AC installation? I’ve had a look through SANS 10142-1 but struggled to find a straight forward answer - maybe I missed something?

 

I plan to install a sub-DB upstairs and need to run 10mm2 cable through the embedded wall conduits with a total cable length of around 12 meters. I’m not worried about saving a couple a couple bucks and buying smaller earth cable, my issue is the conduits are quite small and it’s going to be a really tight fit if I have to use 10mm2 earth cable too. Would it be legal to run 10mm2 phase conductors with 6mm2 earth conductor? 

 

Thanks in advance

17 minutes ago, Agera1993 said:

Hi all,

 

What are the regulations when it comes to selecting a suitable size for your earth conductor in a single phase AC installation? I’ve had a look through SANS 10142-1 but struggled to find a straight forward answer - maybe I missed something?

 

I plan to install a sub-DB upstairs and need to run 10mm2 cable through the embedded wall conduits with a total cable length of around 12 meters. I’m not worried about saving a couple a couple bucks and buying smaller earth cable, my issue is the conduits are quite small and it’s going to be a really tight fit if I have to use 10mm2 earth cable too. Would it be legal to run 10mm2 phase conductors with 6mm2 earth conductor? 

 

Thanks in advance

Yes it is fine. Until you get the SANS table I will use this as a good guide.