Thatdamnjoe

Came across this post and wanted to point out to @Kalahari Meerkat that you cannot assume the earth bond from the municipal side is always available even if power is off- cable theft is a reality in many areas.
This is also the reason why you should not permanently bond your earth to neutral as you could unwittingly become the earth point for your entire neighborhood when the "permanent" bond at the municipal connection is stolen upstream.
 

no three-phase equipment just means no piece of equipment using all three phases at once. Likely you have the same situation as me, which is a bunch of single phase loads split across the phases. It would be very surprising if this is not the case, unless someone has already started tinkering. No self-respecting electrician would have put all the loads on one phase if there were three availble.
 
But its easy to see, switch off the man breaker, disconnect one of the phases from the incomer, switch back one and check if everything still works. (dont do this if you actually have three-phase kit though) Or just trace the incoming phases