21 Apr
2001
21 Apr
'01
5:44 a.m.
On Sat, 21 Apr 2001, Clint Wolff (VAX collector) wrote:
On Sat, 21 Apr 2001 jkunz(a)unixag-kl.fh-kl.de wrote:
What he said!
Protective ground is identical to N. It is only
an extra wire to the N
point. This is needed for protection only. (Therefore it is called
protective ground. ;-) )
Some clarification is in order...
Protective ground is NOT identical to N, even if they are wired together
at the main breaker panel (as in USA). Neutral is a current carrying
conductor, and because of the resistance in the wire, it may be at some
voltage above ground potential. This is why you NEVER attach the
neutral to the protective ground.
Remember: if there is any possibility of current flow, use the Neutral
wire.
The only purpose of the green (ground) wire is to help the overcurrent
device operate-- it is there to make what might be a small leakage to an
electrically isolated chassis into a large fault to ground.
Remember: Always connect the protective ground to the chassis of the
machine.
Do this, and also connect the other end... (Also, in the US, the old
three-prong dryer & range cords are illegal now. Be sure and use a proper
cordset, that provides an equipment ground)
These voltage are high enough you can destroy valuable antique hardware,
which would be bad. You might get shocked too...
in that order...
clint
Bob