How A Valve Guitar Amp Works.

[DrNomis_44]

I have to correct your last point Doc. 240V rms is, in layman's terms, the 'average' of the AC sine wave. The 'peak' voltage of 240V rms is about 340 volts. (339 point something).

(To clarify, as well as rms value of the sine wave, there is also something called the 'average' value. I used the term 'average' in the above explanation so non electrical people have a better chance of comprehending these concepts.)

Even if you accidentally touch one phase of a 3 phase system, you're still 'only' going to get a 240 volt wake up call.

If if you're ever unlucky enough (or stoopid) to touch 2 different phases of a 415 volt 3 phase system, you're gonna cop a peak voltage of about 586 volts. I don't know where you got the value of 678 volts from.

Cheers for that, I obviously got my maths wrong so thanks for clarifying things for us.

Here's how I got my value, I started by dividing 240V AC by .707 to get the peak voltage, then multiplied the resulting figure by two to get the peak-to-peak voltage, maybe I took the wrong approach, maths was never my strongest subject at school.