277V RATED SWITCH
- Thread starter twada
- Start date
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- Location
- Lockport, IL
- Occupation
- Semi-Retired Electrical Engineer
Re: 277V RATED SWITCH
The NEC would allow the use of 277V switches. In Washington State, the Energy Code might require the use of relays, in order to take advantage of energy savings from such features as daylighting and occupancy sensors.
The NEC would allow the use of 277V switches. In Washington State, the Energy Code might require the use of relays, in order to take advantage of energy savings from such features as daylighting and occupancy sensors.
pierre
Senior Member
- Location
- Westchester County, New York
Re: 277V RATED SWITCH
I know this is a forum using the NEC as a guide, but the days of one document for the answer is long gone.
Charlie B's answer is a subtle reminder that as electricians we have more resources to deal with and should make it our responsibility to know what they are. The Energy Conservation Construction document is one of them. Thanks
Charlie.
Pierre
[ September 23, 2003, 02:02 PM: Message edited by: pierre ]
I know this is a forum using the NEC as a guide, but the days of one document for the answer is long gone.
Charlie B's answer is a subtle reminder that as electricians we have more resources to deal with and should make it our responsibility to know what they are. The Energy Conservation Construction document is one of them. Thanks
Charlie.
Pierre
[ September 23, 2003, 02:02 PM: Message edited by: pierre ]
Re: 277V RATED SWITCH
I would think there would be more discription to the question if energy conservation codes or other scenarios were being asked.
In N.C. it can be 50%/100% switching levels as well as other type controls, A/C equipment may or may not require occupancy sensors in some installations etc...
Designers would know these codes.
Roger
I would think there would be more discription to the question if energy conservation codes or other scenarios were being asked.
In N.C. it can be 50%/100% switching levels as well as other type controls, A/C equipment may or may not require occupancy sensors in some installations etc...
Designers would know these codes.
Roger
- Location
- Massachusetts
Re: 277V RATED SWITCH
The way it works around here the Energy code requirements are added to the "normal" controls.
This may mean a wall mount occupancy sensor switch combo which would still need to meet 404.14 Rating and Use of Snap Switches.
Or it could be a ceiling mount occupancy sensor, a central time control, an outside light sensor etc. but we would still have the standard wall switch that has to meet 404.14
The only time I see standard wall switches left out is for large open areas.
The way it works around here the Energy code requirements are added to the "normal" controls.
This may mean a wall mount occupancy sensor switch combo which would still need to meet 404.14 Rating and Use of Snap Switches.
Or it could be a ceiling mount occupancy sensor, a central time control, an outside light sensor etc. but we would still have the standard wall switch that has to meet 404.14
The only time I see standard wall switches left out is for large open areas.
Re: 277V RATED SWITCH
Gentlemen, please don't loose site of the original question. I noticed that "twada" is from Illinois therefore the background of the question MIGHT come from the Chicago Electrical Code. Article 380.14(d) which states "Voltage. Snap toggle switches shall not be used for the control of 277/480 volt circuits".
Regarding the NEC, I don't believe there is any restriction. As long as the switch that is being used is "rated" for the voltage that is being applied to.
Direct answers are usually the best.
Gentlemen, please don't loose site of the original question. I noticed that "twada" is from Illinois therefore the background of the question MIGHT come from the Chicago Electrical Code. Article 380.14(d) which states "Voltage. Snap toggle switches shall not be used for the control of 277/480 volt circuits".
Regarding the NEC, I don't believe there is any restriction. As long as the switch that is being used is "rated" for the voltage that is being applied to.
Direct answers are usually the best.
Re: 277V RATED SWITCH
OK Jerry the answer would be "yes", "no", "depends on where you are", and "depends on what code/codes you are under".
Would this be direct enough?
How can someone "consult" if they are not informed as to what they are consulting?
I think we should be able to give more detail in our profiles. (the profile information has gotten smaller) In many cases there seems to be some open interpretation to "consultant" and "contractor", and it may be true inocent misrepresentation or flat out deception in some cases.
Roger
[ September 23, 2003, 04:39 PM: Message edited by: roger ]
OK Jerry the answer would be "yes", "no", "depends on where you are", and "depends on what code/codes you are under".
Would this be direct enough?
How can someone "consult" if they are not informed as to what they are consulting?
I think we should be able to give more detail in our profiles. (the profile information has gotten smaller) In many cases there seems to be some open interpretation to "consultant" and "contractor", and it may be true inocent misrepresentation or flat out deception in some cases.
Roger
[ September 23, 2003, 04:39 PM: Message edited by: roger ]
- Location
- Massachusetts
Re: 277V RATED SWITCH
Well from an outsiders perspective that makes little sense.
So I can not control a 277 volt circuit with a 277 rated switch?
Well from an outsiders perspective that makes little sense.
Re: 277V RATED SWITCH
This may be a little off the subject, but if you are going to use switches at 277v, don't forget 404.8 b: Voltage between adjacent devices. This requires barriers between devices with a potential difference of more than 300 volts between them. This would include two different phases of 277v (per handbook).
This may be a little off the subject, but if you are going to use switches at 277v, don't forget 404.8 b: Voltage between adjacent devices. This requires barriers between devices with a potential difference of more than 300 volts between them. This would include two different phases of 277v (per handbook).
frenchelectrican
Senior Member
- Location
- Nord'est Wisconsin et Paris France
Re: 277V RATED SWITCH
Steve ;
i just want to make it clear what i read you saying
merci Marc
Steve ;
i just want to make it clear what i read you saying
so if i am reading that right for 277 volts devices with different phase that mean required to use the diver ?? please correct me if i am wrong i thought that if you have 120 v device with 277 volts device i know that required a diviers .
merci Marc
- Location
- Massachusetts
Re: 277V RATED SWITCH
Hi Marc you got it right, if you have more than one phase of a 480 system in a switch box you need the divider.
Easer to plan for all switches on the same phase, I think.
Hi Marc you got it right, if you have more than one phase of a 480 system in a switch box you need the divider.
Easer to plan for all switches on the same phase, I think.
frenchelectrican
Senior Member
- Location
- Nord'est Wisconsin et Paris France
Re: 277V RATED SWITCH
bob merci beaucoup ( thank you very much )
at least i am pay attention to the details and i want to double check it make sure my mind is not teasing me. anyway for office system, yeah i try to keep the same phase much as i can, but majority of them i nearly ran into . useally are one or two switching devices the most but more than that i useally put a divider to indentify the phase regarding the voltage to advoid nasty suprise .
merci , marc
bob merci beaucoup ( thank you very much )
at least i am pay attention to the details and i want to double check it make sure my mind is not teasing me. anyway for office system, yeah i try to keep the same phase much as i can, but majority of them i nearly ran into . useally are one or two switching devices the most but more than that i useally put a divider to indentify the phase regarding the voltage to advoid nasty suprise .
merci , marc
pierre
Senior Member
- Location
- Westchester County, New York
Re: 277V RATED SWITCH
I am in total agreement with Bob - Iwire here.
When using terms - I know 0 about the Chicago amendments- that is not a derogatory statement, I just am not familar with it.
How does Chicago define Snap Switch?
The definition of a snap switch that I 'think' I know deals with the 'older' style switch, where the rating of the switch is different than the rating of todays '277v rated Toggle switch'. If in Chicago they cannot use a 277v rated toggle switch to turn on office lights, how do they do it?
I am not trying to be $^*^(^(, I am curious
Pierre
I am in total agreement with Bob - Iwire here.
When using terms - I know 0 about the Chicago amendments- that is not a derogatory statement, I just am not familar with it.
How does Chicago define Snap Switch?
The definition of a snap switch that I 'think' I know deals with the 'older' style switch, where the rating of the switch is different than the rating of todays '277v rated Toggle switch'. If in Chicago they cannot use a 277v rated toggle switch to turn on office lights, how do they do it?
I am not trying to be $^*^(^(, I am curious
Pierre
Re: 277V RATED SWITCH
pierre - How does Chicago define Snap Switch?
2001 Chicago Building Code Article 100 Definitions
"Switches:
General-Use Snap Switch: A form of general-use switch constructed so that it can be installed in device boxes or on box covers, or otherwise used in conjunction with wiring systems recognized by this chapter."
pierre - How does Chicago define Snap Switch?
2001 Chicago Building Code Article 100 Definitions
"Switches:
General-Use Snap Switch: A form of general-use switch constructed so that it can be installed in device boxes or on box covers, or otherwise used in conjunction with wiring systems recognized by this chapter."
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