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We do a lot of these....If it is a TNCS we use that to protect the SWA and gland it into an insulated DB where the Tncs earth is separated...(no banjo!)....everything upstream of this is on a rod.........normally prewired units are bonded,but often this has come adrift or corroded so check. We normally carry out a brief PIR on units which dont come with a cert from the hire company...they are often in a state!
That is a suprise as last year I did quite a bit of work for a company called A1 they are a hire company and hire out quite a lot of these port-a-cabin type offices, and it was carrying out a PIR on the unit for them before they sent it out.
It was just a short term thing as their own sparks was off sick at the time, but I was pleasently suprised how decent they were, compared to the ones you seem to do Wirepuller, and to be honest the ones i'm use to