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It's not my test kit and have other staff would be silly to have 20 testers don't you think ?  Ze/Ra is the term given to the resistanc of the earth fault path.  

Yes test button on the rcbo  only doing initial inspection broke down each leg of lighting hoping it would be on just one. But think I have it answer above 

I have not tested the Ze/Ra yet.  will be useing fluke multifunctional  and yes disconnect as per testing. rcbo's mk. They are single pole ..... damn i did not install sub did, just got a call to site to look at it.

Has the incoming feed been split before the main c/u ? Tail blocks ?

Hi Working on a site that was supplied with a tt system, near end of job keeping the tt set for landlord supply. i put in 3 raidials out side lighting (low watt led). all back to a 6 amp 30ma rcbo type b also have 32amp 30ma rcbo type b( that's fine)  Now the 6 amp rcbo will not test trip...