Mv & hv

[Alwayslearningelec]

What is usually considered meduim voltage then high voltage. I know sometimes guys refer to 277/480 HV which it is really not. I believe 13.8KV would be MV....??? THanks.

 

[kwired]

Depends on who you are talking to.

There are signs on equipment operating at 120 volts warning of high voltage all the time.

Utility and industrial electricians consider anything under 600 to be low voltage. Not sure what these guys will call it if it below 50 volts.

All levels can be hazards but there are thresholds where different practices come in to play.

 

[K8MHZ]

What is usually considered meduim voltage then high voltage. I know sometimes guys refer to 277/480 HV which it is really not. I believe 13.8KV would be MV....??? THanks.

Well, MV cable is rated at 2001 volts or higher and can be used up to 35,000 volts. (Article 328).

But, there is no solid consensus concerning the actual definition of medium voltage.

Various definitions exist. In general, medium voltage is a term used by the electrical power distribution industry. Here are a few ways medium voltage is defined:


ANSI/IEEE 1585-2002 refers to: Medium Voltage (1 - 35 kV). [It is assumed that this is ac.]


IEEE Std 1623-2004 refers to: Devices rated to medium voltage (1 kV-35 kV). [It is assumed that this is ac.]


NECA/NEMA 600-2003 refers to "medium voltage cables rated from 600 volts to 69,000 volts AC"


Littlefuse says: "The terms ?Medium Voltage? and ?High Voltage? have been used interchangeably by many people to describe fuses operating above 600 volts. Technically speaking, ?medium voltage? fuses are those intended for the voltage range from 2,400 to 38,000 VAC."


Siemens says, "Medium voltage metal-clad switchgear (above 1000Vac up to 38kVac)"
This last one covers most of the definitions. Thus, probably a good working definition of medium voltage is from 1kVac to 38kVac.

http://www.highvoltageinfo.com/2007/07/what-is-medium-voltage_13.html

So, even with all the ambiguity, 13.8 kV is MV.

 

[charlie b]

In my world, "low" is below 120, "high" is between 120 and 600, "medium" is between 600 and 25,000, and anything above that is uninteresting. And please don't ask why "medium" is higher than "high."

 

[K8MHZ]

In my world, "low" is below 120, "high" is between 120 and 600, "medium" is between 600 and 25,000, and anything above that is uninteresting. And please don't ask why "medium" is higher than "high."

If I got to make up the definitions, LV would be 0 - 50. JPV (Just Plain Voltage) would be 50 - 600, MV 600 - 35,000. HV would be 35,000 to 1.5 million and over 1.5 million I would call lightning.

 

[zog]

Depends on the what you are talking about, equipment ratings or utilzation. Per IEEE:
LV <600V
MV 601-69kV
HV 69kV-230kV
EHV 230kV-800kV
UHV >800kV

 

[sgunsel]

Just to keep it interesting, in electronics today anything over 12 VDC these days is considered "high" voltage. Of course, most new electronic circuits only operate at 1+ to 5 vdc.

 

[Alwayslearningelec]

In my world, "low" is below 120, "high" is between 120 and 600, "medium" is between 600 and 25,000, and anything above that is uninteresting. And please don't ask why "medium" is higher than "high."

lol...thanks.