[GreenKeys] Teletype Model 15 Pull Bar?

[Lester Veenstra]

Does not really sound much difference from the US handling of protective
earth and neutral.

Lester B Veenstra  K1YCM  MØYCM  W8YCM   6Y6Y
lester at veenstras.com

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Keyser WV 26726
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-----Original Message-----
From: GreenKeys [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Dave
Horsfall
Sent: Friday, March 31, 2017 8:58 PM
To: Greenkeys
Subject: Re: [GreenKeys] Teletype Model 15 Pull Bar?

On Fri, 31 Mar 2017, Larry Tighe wrote:

> Thanks for that information on voltage.  Can you tell me if one of the 
> two legs is at ground potential or is the voltage "floating" above 
> ground?

Ahh...  The answer is Yes and No :-)

Australia, in common with most of Europe, uses "MEN" i.e. Multiple Earth
Neutral.  Each outlet is 3-pin (polarised of course), with Active, Neutral,
and Earth.  The difference is that Earth is bonded to a copper stake outside
the premises, whereas Neutral is bonded back at the local distribution
point.  It's not unusual (to quote Tom Jones) to see several volts 'twixt
Neutral and Earth, due to earth resistance and leakage.

This is where it gets complicated, such as appliance leakage and having no
residual current devices (which you won't find in old premises), with Earth
floating up to 120v and you touch a metal sink...  You will never ever see
me touching something electrical and something grounded at the same time;
how secure is *your* ground bond?  Trouble is, copper pipes are beginning to
be replaced with plastic, because the bean-counters are now running the
show.

AS/3000 pretty much says it all.  (Yes, my Daddy was an electrician.*)

[*]

Yes, I know lots of sparkie jokes, such as:

What's black and crisp, and hangs from the ceiling?  A dead electrician.

Remember: there are old electricians, and there are bold electricians...

--
Dave Horsfall DTM (VK2KFU)  "Those who don't understand security will
suffer."