This should be NTC...can't let go a good story..
Am repairing a lot in our old summer house. Removed old armature of
porcelain from 1930 or so. Two wires hanging on wall. Remove fuse to be
sure. Next day coming with new lampholder type what you got on ships
(sailors know). Fastens the lamp on the wall, mounts the two wires, one
black, one brown. Install glowlamp. Put glass on. Go downstairs and put
fuse in. Step up, switch on, expecting masterpiece work. No light.
Hmmm..old fuse. New fuse in. Up stairs. Toggle switch. Dead. Hmmm..bad
glowlamp. Downstairs, find three glowlamps in a cupboard. Test number
one..dead..number two..dead, number three...dead. What the h..!
Downstairs with growing irritation. Testing lamps in other lampholder,
all OK. Hmmm..no voltage. Of course...cheap shit (John Burke), the
springs on inside of the lampholder don't make contact of course. Pliers
and bending springs, put glowlamp back. Damn..forgot the
fuse..downstairs, put in fuse..back upstairs. Switch on. Black.
Downstairs with fretting teeth, got a electricians tester, the one that
you keep near wires and it lightens up. What? There IS voltage on both
wires! Hmmm...half an hour has gone. Remove lampholder, goes into waste
bin. Take car to nearby shop and buy another armature. Upstairs with
heavy breathing...fasten new lamp very fastly, switch on. Black. I
feared something had happened with my brain. This isn't me..30 years
with electronics. OK. You asked for it damn fuse. I took a screwdriver
and put it across the open wires in order to make a big flash. Nothing
happened! What??? Tested with voltage tester, voltage on both wires.
Mama Mia, this is mad! My wife wondered why I was hammering on the
floor. Followed the installation cable all the way to the fuse panel.
Opened everything and tested, voltage everywhere. And....my eyes found
something..someone had, long ago, used two pole screws for connection,
but one screw was not fastened. The wire had oxidized, there was no
pressure, and the oxide had been thicker and thicker during decades.
So..gentlemen, this is the end of the story..THERE WAS NO RETURN. The
phase was OK, but no return, or neutral as you may call it. The thin
oxide layer admitted voltage, but no current! I found the failure. My
reputation is repaired.
Inge
-----Ursprungligt meddelande-----
Från: TechNet [mailto:[log in to unmask]] För Creswick, Steven
Skickat: den 16 maj 2007 21:16
Till: [log in to unmask]
Ämne: Re: [TN] SV: [TN] AC Outlets in China
I thought Inge had crossed the line
Steve
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Whittaker, Dewey
(EHCOE)
Sent: Wednesday, May 16, 2007 3:12 PM
To: [log in to unmask]
Subject: Re: [TN] SV: [TN] AC Outlets in China
I'm positive you came up with that on your own accord? Very good!
Dewey
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Hfjord
Sent: Wednesday, May 16, 2007 12:02 PM
To: [log in to unmask]
Subject: [TN] SV: [TN] AC Outlets in China
Don't be neutral, be on safe ground
Inge
-----Ursprungligt meddelande-----
Från: TechNet [mailto:[log in to unmask]] För Ahne Oosterhof
Skickat: den 16 maj 2007 16:54
Till: [log in to unmask]
Ämne: Re: [TN] AC Outlets in China
I don't know for sure how it is done in China, but in most countries
that
are using 220 to 240V ac it comes from a three phase, Y-configured
system,
consisting of three phases, a neutral and ground. That means 220V from
each
phase to neutral and 380 to 400V between phases.
The result is that neutral is close to zero, but when the load (and
resulting voltage drops) on each of the phases is not equal, neutral
will
not be zero volts. So don't use neutral as ground!
Happy trails,
Ahne.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of James Verrette
Sent: Tuesday, 15 May, 2007 23:55
To: [log in to unmask]
Subject: [TN] AC Outlets in China
We are plugging an IEC to US plug power cord into a universal power
strip in
Shenzhen. The IEC jack on the equiment is wired according to the L N
and G
markings on it. When we plug into the power strip the neutral is at 220
with respect to gnd and the line is very low AC voltage with respect to
ground. THis tells me we have the line and neutral swapped. Is the
position
of the line with respect to the ground in the outlet the opposite in
China
as in the US?
I suppose if we actually bought a China power cord we wouldn't be having
these issues. Supply is universal input so we don't need a transformer.
-Jim
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