Once again I must gently point out your apparent lack of experience of the Real World here, Neil. Or perhaps you have just been lucky! smile

Meanwhile, you had better define "emergency circuit". One that is supplied by the standby generator in the event of general mains failure? That is, within ten seconds of interruption, inshallah?

And ... still a quiet Sunday morning out there (at this time of year), surely?

If you don't inspect ... don't expect.