[Milsurplus] Power line safety

[Peter Gottlieb]

In the US the neutral is connected to earth ground at the house main panel box. 
  However, there is never any guarantee the outlets, cords and radio are wired 
correctly and those of us (like myself) who have been bitten will never trust 
that a unit switched "off" is without mains voltages floating about.  Whenever I 
  need to do work involving putting my hands into something, I physically 
disconnect it from the power line and then discharge power supply capacitors. 
Extra care for high voltage equipment such as transmitters, laser/flashlamp 
stuff, plasma weapons, etc.

Peter


pete williams wrote:
> 
>  Maybe the  topic  has  been hard wired  before  but the AC input
> wiring  schematic to the  R-390A should be a  source of inspiration
> for those seeking longevity.  For us   in OZ using 3 wire ...active,
> neutral , ground  240 V, the  problems  could be  acute.
> The input terminals R-390A rear,  can accept  either the active or
> neutral  but only one is switched via the  FUNCTION  switch.
> The rx is  switched off if the   neutral line  happens  to be wired
> via  fuse to the  switch,  but still leaves the   active line live
> through  the loom to the power  transformer
> . Inadvertent  completing a body circuit  via the  active unswitched
> line in the rx to neutral - ground  IF  so wired,  could be fatal.
> Also completing  the  circuit via the switched neutral line  to
> CHASSIS ground  would also be a fatal attraction !. I don't know  how
> US 115 V lines perform but reckon same  principles apply.
> 
>  Whatever, switch the  active.... yep once bitten , twice  shy !
>  73
> Pete VK 3 IZ
> 
> 
> Pete D . Williams
> METUNG 3904
> Australia
> jupete at bigpond.net.au
> 
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