I read in !emc-pstc that Rich Nute ri...@sdd.hp.com wrote (in
20022357.paa03...@epgc196.sdd.hp.com) about 'CLASS 11(DOUBLE
INSULATED) 2/3-CORE CABLE', on Mon, 12 Nov 2001:
Hi John:
No; France and Norway have 'IT' systems, in which grounding is only to
prevent static charge
Hi John:
No; France and Norway have 'IT' systems, in which grounding is only to
prevent static charge build-up; the neutral is grounded through an
impedance at the sub-station. AIUI, this is used in mountainous
districts where ground paths are long and of low conductivity. There
I read in !emc-pstc that Ted Rook t...@crestaudio.com wrote (in
sbe6c255@peavey.com) about 'CLASS 11(DOUBLE INSULATED) 2/3-CORE
CABLE', on Mon, 5 Nov 2001:
Could the grounding safety issues we are confronted by have been avoided if
the
incoming AC supply had remained 'balanced' that is,
Could the grounding safety issues we are confronted by have been avoided if the
incoming AC supply had remained 'balanced' that is, not referenced to local
ground anywhere?
Or to put it another way.
Some where along the way it was decided to ground the neutral at the premises
entrance. Why?
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I read in !emc-pstc that geor...@lexmark.com wrote (in 200111051917.OAA
13...@interlock2.lexmark.com) about 'CLASS 11(DOUBLE INSULATED)
2/3-CORE CABLE', on Mon, 5 Nov 2001:
A word of history on Class I vs. Class II, as I understand it.
In the beginning there was no such thing as earth grounding
I read in !emc-pstc that Andrew Wood andrew.w...@landinst.com wrote
(in e49d8b319a2fd5119e2808002bc33c591c8...@landuk1.landinst.com) about
'CLASS 11(DOUBLE INSULATED) 2/3-CORE CABLE', on Mon, 5 Nov 2001:
All
I have a piece of equipment falling under the scope of EN6010.
Is that a typo or do
A word of history on Class I vs. Class II, as I understand it.
In the beginning there was no such thing as earth grounding in
homes and offices for the needed electrical appliances. The
equivalent of our present double insulation was required to prevent
against electric shock.
When
Several years ago I had the need to explain this same issue.
Similarly most of the inquiries came from the U.K. Here are
some exerpts from a white paper done to address this issue:
***
This document addresses the nature and safety of two-wire
ITE products.
The international
At home my video recorder, hi-fi and Satellite box, have metal outer
enclosure. But are supplied by a two pin IEC320 C8 connector, running back to a
UK three pin plug. The earth core is simply not present in the power cord.
Products are marked
with the Square within a Square and the manuals
Andrew
Don't try to explain that double insulation and earthing are both acceptable
alternatives - only 1 persion in 10 will understand and the public won't
care!
Option 1
- I think knowledgeable technical people in most countries would actually
prefer this for the reasons you mention in your
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