In message <[email protected]>,
dated Wed, 22 Feb 2012, "James, Chris" <[email protected]> writes:
Some companies and persons use the term "medium voltage" to describe
distribution voltages in range 3.3 kV to 72.5 kV to distinguish these
from the higher values of voltage associated with transmission systems.
There is no International Electrotechnical Vocabulary (IEV) meaning
which specifies values; all that is stated is that the upper value lies
between 30 kV and 100 kV.
The HSE document is not quite accurate:
IEV 601-01-28
en medium voltage (abbreviation: MV) (not used in the UK in this sense,
nor in Australia)
any set of voltage levels lying between low and high voltage
NOTE – The boundaries between medium and high voltage levels overlap
and depend on local circumstances and history or common usage.
Nevertheless the band 30 kV to 100 kV frequently contains the accepted
boundary.
The term has not been used in the UK to prevent confusion with the
widely understood use of the term for 415 V 3 phase systems.
Any such usage is wrong: the voltage is now declared to be 400 V and is
undoubtedly LV.
--
OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
If 'QWERTY' is an English keyboard, what language is 'WYSIWYG' for?
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