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The control measures we insist are in place, are IP2X equipment, GS38 leads, two man rule with second man having resus training, among others. So I feel the risk has been reduced to as low as reasonably practicable. An d my instinct tells me that a measured Zs reading must be more accurate than a calculated one, since it will include all parallel paths under test.
The contractor is happy to live test distribution circuits, so it seems they want to pick and choose.
They also state that this is how things are now, and have worked at many different sites, Cross Rail, Heathrow, various MOD sites etc, and that they al accept this as common practice.
I like some opinions to find out what's going on out there on other sites.
The ALARP principle has to consider the economic element too and that will vary between companies/projects, it seems to me that you have reasonable measures in place. IP2X protects against accidental contact which to my mind is sufficient (but not where I work) and the 2 man rule - an extra layer of protection.