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May 2007

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TechNet E-Mail Forum <[log in to unmask]>, Hfjord <[log in to unmask]>
Date:
Wed, 16 May 2007 21:02:13 +0200
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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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