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Terminology confusion

Kelly Marie Angel
Hi all the term medium voltage has as far as I know been out of favour for a good few years i think I'm right that any thing up to 999 volts is LV and anything above that is HV is this still the situation? I ask because I've seen a few videos and Web pages recently describing  medium voltage switch gear and equipment these are mostly pages that keep coming up now following my searches on power factor correction. Which in turn were a result of my post on large cotton reels in substation you now how it is a few mouse clicks and your into something else
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    Also there's the thing that in the electronics world the terms HT and LT are used I've seen sometimes that even 12 volts is referred to as HT

    Tension or Pressure used to be considered alternative descriptions to voltage - LT/HT is still common in the automotive industry for example. I'd be surprised at 12V being referred to as HT though - you sometimes come across it in cars but it'll usually be referring to the ignition system - traditionally supplied by a transformer (spark coil) and so would itself be at several thousand volts even though it's supplied by 12V.


      - Andy.
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    Also there's the thing that in the electronics world the terms HT and LT are used I've seen sometimes that even 12 volts is referred to as HT

    Tension or Pressure used to be considered alternative descriptions to voltage - LT/HT is still common in the automotive industry for example. I'd be surprised at 12V being referred to as HT though - you sometimes come across it in cars but it'll usually be referring to the ignition system - traditionally supplied by a transformer (spark coil) and so would itself be at several thousand volts even though it's supplied by 12V.


      - Andy.
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