"Dave Plowman (****ing Nut Case TROLL )
Phil Allison

In UK TV studios etc, before the days of RCDs etc, every single item
of unknown equipment - like say a guitar amp etc supplied by a
musician - was fed via a mains isolation transformer. Expensive and
time consuming but very necessary.

** Really ????

Yes really.

** ********.

Bet the Beeb et alia stopped doing that when they nearly electrocuted
the first guitarist.

Sigh.

** Go **** yourself - pommy ****head.


1. The most common error in AC plug wiring is Neutral-Earth reverse -
the item works and there is no big problem until you find an AC outlet
that has Active and Neutral reversed.

Then that device would simply not work.

** Neither would the user - ever again - pommy ****head.


2. Add a 240:240V iso-transformer that carries the supply ground
through to the outlet and it becomes instantly lethal. Draw it out on
paper if you doubt me.

That's why they didn't.

** Didn't what - pommy ****head ??


FYI:

Supply earth goes direct to one side of the amp's AC tranny, then the
iso-tranny's 240V winding and back to the amp's chassis. The amp will
not run - but the chassis is 240AC live.

There is no 'live' and 'neutral' on the output of an isolating
transformer.


** That is the reason it becomes instantly lethal - pommy ****head.

Cannot draw a simple schem to save you life - can you ???



..... Phil