Range of LV,MV & HV

It is not universally the same everywhere, but in general the rules are:

Low Voltage = under 1,000VAC

Medium Voltage = 1,000-34,500VAC

High Voltage = over 34,500VAC

But I doubt this will be the only answer you will get on this subject...

There really is no single standard.

One often sees signs in industrial settings that read "Danger: High Voltage". These are found an almost all electrical equipment cabinets, many of which contain parts running at 480V or less.

This link provides several interpretations. It's a matter of perspective and context.

That's an interesting link. We follow the guide of 40+ volts being dangerous (I'm told that higher voltages can upset the heart in some way). We use voltages up to 30kV although at very low current. We don't really think of anything below about 100V being 'high voltage'.

And expanding a bit further, the upper limit of standard system voltages classified as High Voltage (HV) in the U.S. is 230 kV nominal; 345 kV - 765 kV nominal are Extra High Voltage (EHV) and system voltages above 765 kV are classified Ultra High Voltage (UHV).

In my country we call

0-50V "smáspenna" mini-voltage,

50-1000V = low voltage,

and above 1000V = high voltage.

I don't know this is the standard but it is what I was taught. It also may vary depending on the industry. If you are in Power Distibution, the answer is quite different.

Low Voltage in my feild, is 0-65V - Med 65-260 - High 260 +

In the Building Industry, code defines them, most Low Voltage is 24V AC/DC sometimes 12V DC or 5VDC are used for controls. Concidered low voltage because most peaple will not even feel a shock.

Medium, generally requires a licenced electrician to certify the job.

High voltages are useually concidered above what would be used in a normal home (120/240) and is normally for commercial and high power useages.

Thats is what i was taught back in the 70's

LV < 600v

mv 600v-69kv

hv 69kv-230kv