A single core cable wont be run on it's own. Megger between each of the various cables associated with the circuit, and finally megger each cable to earth.
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The reports of my death are greatly exaggerated.
Must! Obviously, the "single-core cable" too must be an insulated one! Isn't it? The moment there is an insulation involved, you must check the insulation resistance (that is, by meggering)! No excuses, whatsoever!