Pre-inspection and test

Would it mean "check that the electrical systems supplying the equipment are safe, before inspecting/testing/commissioning this equipment"?

If you are not careful you could read it so you  need a pre pre-inspection inspection, just to make sure it is safe and sensible to proceed  to do the pre-inspection. In reality, the 'step zero' of any procedure, inspection,dead or live tests, system commissioning or other  is to look at the whole picture, and decide what you are going to do next, and to mentally set the steps out in a minimum effort and minimum risk sequence  that maximizes test coverage, or if you prefer, that minimizes the risk of any credible fault not being spotted.  I suspect that that is really what is meant.
That may well include checking that the incoming supplies are indeed what you think they are and there is no neutral to old black-blue phase reversals in some cases, and it is not a 690V 3 phase instead of 400 and all that good stuff, and it should also involve a critical walk round to make sure that what is about to be commissioned does not still have any loose ends dangling, either metaphorically; or in a few cases probably literally as well (not that we've ever seen that oh no.... Where is a long nose icon when you need it...).

As sentences go, it could be clearer.

Mike.

If you are not careful you could read it so you  need a pre pre-inspection inspection, just to make sure it is safe and sensible to proceed  to do the pre-inspection. In reality, the 'step zero' of any procedure, inspection,dead or live tests, system commissioning or other  is to look at the whole picture, and decide what you are going to do next, and to mentally set the steps out in a minimum effort and minimum risk sequence  that maximizes test coverage, or if you prefer, that minimizes the risk of any credible fault not being spotted.  I suspect that that is really what is meant.
That may well include checking that the incoming supplies are indeed what you think they are and there is no neutral to old black-blue phase reversals in some cases, and it is not a 690V 3 phase instead of 400 and all that good stuff, and it should also involve a critical walk round to make sure that what is about to be commissioned does not still have any loose ends dangling, either metaphorically; or in a few cases probably literally as well (not that we've ever seen that oh no.... Where is a long nose icon when you need it...).

As sentences go, it could be clearer.

Mike.