Medium Voltage
- Thread starter sdilucca
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petersonra
Senior Member
- Location
- Northern illinois
- Occupation
- engineer
Re: Medium Voltage
it sort of depends, but I consider low voltage to be under 600V, and medium voltage to be above 600V, maybe up to 6600V (or thereabouts).
But thats cause when I think of MV I think of 4160V or MV VFDS and they generally go up to about 6600V.
it sort of depends, but I consider low voltage to be under 600V, and medium voltage to be above 600V, maybe up to 6600V (or thereabouts).
But thats cause when I think of MV I think of 4160V or MV VFDS and they generally go up to about 6600V.
Re: Medium Voltage
During my 18 years of working or a major electrical manufacturer I must admit some terms were a bit elusive this of which is included.
It was considered that voltages in the rage of 1001v to 38000v was medium voltage. That's was the product line was divided in, i.e. medium voltage switchgear and motor starters. Common motor starter were either 2300v or 4160v but were rater up to 7200v while switchgear commonly were 2300, 4160, 12000v, 12470v, 13200v, 13800v, with 23000 and 34500 commonly on the high end. These seem to be the more common voltages that I have found but there are other distribution voltages in between also.
Even though common low voltage distribution systems are 480 and sometimes 575v the devices are rated 600v while many of these same devices are available in ratings of up to 1000v. Off hand I can think of some molded case circuit breakers and control(vacuum contactors).
However, I can't remember having to provide equipment with rating of 6001-1000v except for the mining industry.
During my 18 years of working or a major electrical manufacturer I must admit some terms were a bit elusive this of which is included.
It was considered that voltages in the rage of 1001v to 38000v was medium voltage. That's was the product line was divided in, i.e. medium voltage switchgear and motor starters. Common motor starter were either 2300v or 4160v but were rater up to 7200v while switchgear commonly were 2300, 4160, 12000v, 12470v, 13200v, 13800v, with 23000 and 34500 commonly on the high end. These seem to be the more common voltages that I have found but there are other distribution voltages in between also.
Even though common low voltage distribution systems are 480 and sometimes 575v the devices are rated 600v while many of these same devices are available in ratings of up to 1000v. Off hand I can think of some molded case circuit breakers and control(vacuum contactors).
However, I can't remember having to provide equipment with rating of 6001-1000v except for the mining industry.
- Location
- Lockport, IL
- Occupation
- Semi-Retired Electrical Engineer
Re: Medium Voltage
I spent a year working at an engineering firm that only did electrical design, and that only worked with "medium voltage" distribution systems. We defined that term as 601 through 25,000. But it is open to many interpretations.
The really hard phrase to pin down is "low voltage." To some, myself included, it means anything 600 volts and below. From a practical perspective, that really means "120 to 480." To others, "low voltage" means communications, fire alarm, and security systems, and to that group 120 VAC is "high voltage."
So me recommendation is that you make sure the person you are talking to uses the same definitions, or you two will get confused.
I spent a year working at an engineering firm that only did electrical design, and that only worked with "medium voltage" distribution systems. We defined that term as 601 through 25,000. But it is open to many interpretations.
The really hard phrase to pin down is "low voltage." To some, myself included, it means anything 600 volts and below. From a practical perspective, that really means "120 to 480." To others, "low voltage" means communications, fire alarm, and security systems, and to that group 120 VAC is "high voltage."
So me recommendation is that you make sure the person you are talking to uses the same definitions, or you two will get confused.
charlie
Senior Member
- Location
- Indianapolis
Re: Medium Voltage
The way we consider the ranges are:
LV = Voltage levels that are less than or equal to 1 kV
MV = Voltage levels that are greater than 1 kV, but less than or equal to 35 kV
HV = Voltage levels that are greater than 35 kV, but less than or equal to 230 kV
EHV = Voltage levels that are greater than 230 kV
Obviously, the National Electrical Code doesn't have the same ranges.
The way we consider the ranges are:
LV = Voltage levels that are less than or equal to 1 kV
MV = Voltage levels that are greater than 1 kV, but less than or equal to 35 kV
HV = Voltage levels that are greater than 35 kV, but less than or equal to 230 kV
EHV = Voltage levels that are greater than 230 kV
Obviously, the National Electrical Code doesn't have the same ranges.
zog
Senior Member
- Location
- Charlotte, NC
Re: Medium Voltage
The IEEE changed the definition of MV a few years ago to 1kV to 69kV and HV is now 69kV to 230kV. EHV is 230kV-800kV and they added a Ultra high class for anything >800kV.
The IEEE changed the definition of MV a few years ago to 1kV to 69kV and HV is now 69kV to 230kV. EHV is 230kV-800kV and they added a Ultra high class for anything >800kV.
jwelectric
Senior Member
- Location
- North Carolina
Re: Medium Voltage
328.2 Definition.
Medium Voltage Cable, Type MV. A single or multiconductor solid dielectric insulated cable rated 2001 volts or higher.
328.2 Definition.
Medium Voltage Cable, Type MV. A single or multiconductor solid dielectric insulated cable rated 2001 volts or higher.
- Location
- Lockport, IL
- Occupation
- Semi-Retired Electrical Engineer
Re: Medium Voltage
Well, at least we all agree on something!
Well, at least we all agree on something!
charlie
Senior Member
- Location
- Indianapolis
Re: Medium Voltage
Thanks Zog.
Thanks Zog.
zog
Senior Member
- Location
- Charlotte, NC
Re: Medium Voltage
jwe,
That is the cable definition, which I always thought was funny because they say 2000 and above so if a cable exsisted that was rated at 1,000,000 volts it would still be a MV cable.
The IEEE actually has several different definitions for equipment specific stuff. The values I posted are for system voltages.
jwe,
That is the cable definition, which I always thought was funny because they say 2000 and above so if a cable exsisted that was rated at 1,000,000 volts it would still be a MV cable.
The IEEE actually has several different definitions for equipment specific stuff. The values I posted are for system voltages.
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