10-11-2012, 02:03 PM
Earthing – Myths AND Facts
Earthing – Myths.pdf (Size: 263.39 KB / Downloads: 72)
Problems in industrial/commercial premises
wiring & grounding account for a large share of
all reported power quality problems. The
greatest number of wiring and grounding
problems is in the feeders and branch circuits
serving critical loads. The first activity in
checking for PQ problems is to survey the
soundness of the power distribution system and
grounding system, supplying the equipment
Myth:
‘Grounding’ implies connection of
current carrying parts to ground, like
transformer or generator neutral and
‘Earthing’ implies connection of non-current
carrying parts to ground, like metallic
enclosures.
To quote from IEC 60050:
“The terms ‘earth’ as well as ‘ground’ have both been
in general use to describe the common power/signal
reference point interchangeably around the world in
the Electro-technical terminology. While the USA and
other North American countries favor the use of the
term ‘ground’, European countries including the UK
and many other Eastern countries prefer the term
‘earth’”.