On 07/04/2020 10:24, simon mitchelmore wrote:
testing, I think the insulation test would be reduced to 250v instead of 500v which if I remember right is permissible in the regs. Seem to recall that's how most neon indicator lights in sockets get blown is by L to N ring main wiring testing at 500v!

Why should a neon blow under those circumstances? Double the current
through the ballast resistor, but still bugger all energy.