Indeed, I guess that is exactly what I meant by "reliable". in the event of spade going in, the earth path is assured before anything else is contacted. whilst the CPC may be doing its job, one would most likely strike into an active conductor before the CPC.
As I said, although I haven't found (haven't yet looked for!) them, I'm pretty certain that at least some DIY books of yesteryear actually advised that practice. I'll try to find time to have a look later.
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