fmtjfw
Senior Member
- Location
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Section/Paragraph: 110.4 Voltages.[NEW]Table
New Text
110.4 Voltages.
Throughout this Code, the voltage considered shall be that at which the circuit operates.
The voltage rating of electrical equipment shall not be less than the nominal voltage of a circuit to which it is connected. All voltages specified in this Code are nominal voltages unless explicitly prefixed with actual. Three systems of voltages are used as described in Table 110.4 Voltages. Voltages listed in a single row are meant to be used in describing the same circuit.
Table 110.4 Voltages (60 Hz)
* uses the NEC
# uses the Canadian Electrical Code
Substantiation
General
NEC 2014 contains 317 sentences containing nominal. It contains 2744 sentences containing volts, voltage, or V. It is clear that the use of (or absence) nominal modifying voltage references follows no particular pattern. Having nominal appear and not appear with voltage references when nominal is the intention adds confusion and is in conflict with NEC_StyleManual_2011.pdf:
"3.3.5 Parallel Construction. Parallel construction means stating similar requirements in similar ways for greater consistency. This helps makes the NEC clear for users. Lack of consistency often creates confusion, causing users to ask: Does this difference in wording represent a different requirement? Or is it simply two different ways of trying to say the same thing?"
I suspect that nearly all, if not all, voltages are nominal voltages. It would be simpler to indicate that all voltages are nominal unless denoted actual and remove nominal from the text.
Specific
This submission emphasizes that nominal applies unless actual is specified, and adds a Table 110.4 Voltages. to correlate the voltages (nominal, device rating, and motor) that are equivalent. The table need some or all of the blank spaces filled in by someone to whom the expensive standards are available. The Country column may be deleted and "odd" voltages removed.
Several voltage systems are used in this Code are based on the ANSI-C84 standard, the NEMA device rating voltages, and motor ratings. It is appropriate to indicate that 115V, 120V and 125V and other pairings denote the same "nominal" circuit voltage.
Coordination
Inserted Deleted
New Text
110.4 Voltages.
Throughout this Code, the voltage considered shall be that at which the circuit operates.
The voltage rating of electrical equipment shall not be less than the nominal voltage of a circuit to which it is connected. All voltages specified in this Code are nominal voltages unless explicitly prefixed with actual. Three systems of voltages are used as described in Table 110.4 Voltages. Voltages listed in a single row are meant to be used in describing the same circuit.
Table 110.4 Voltages (60 Hz)
System or Nominal | Device Rating | Motors | Country |
??? | | | Chile* |
110 | | Belize*, British Virgin Islands*, Columbia*, Guam*, US Virgin Islands*, Venezuela* | |
110/220 | Belize* | ||
120 | 125 | 115 | American Samoa*, Bahamas#, Canada#, Costa Rica*, Ecuador*, Panama*, Puerto Rico*, USA* |
120/240 | 125/250 | 115/230 | American Samoa*, Canada#, USA* |
120/240 3-phase | 125/250 | 115/230 | American Samoa*, USA* |
120/208 Y | 125 | 115 | American Samoa*, Bahamas#, Bermuda, Canada#, Puerto Rico*, USA* |
120/208 Y(V) 2-Phase | 125 | 115 | American Samoa*, USA* |
127 | Mexico* | ||
190/380 Y | 200 | Belize*, British Virgin Islands*, Guam*, US Virgin Islands* | |
208 3-Phase | 200 | Ecuador* | |
220 | Peru*, Philippines*, | ||
220 3-Phase | Mexico*, Peru* | ||
220/380 Y | Philippines* | ||
240 | 250 | 230 | USA* |
240 3-Phase | 250 | 230 | Canada#, Costa Rico*, Panama*, USA* |
240 3-Phase Delta | 250 | 230 | American Samoa*, USA* |
277/480 Y | 250 | 230 | American Samoa*, Canada#, USA* |
347 | 250 | 230 | Canada#, USA* |
347/600 Y | 250 | 230 | Canada#, USA* |
480 3-Phase | 460 | Canada#, Mexico*, USA* | |
600 | 575 | Canada#, USA* | |
2400/4160 | 2300 | USA* | |
4000 | USA* | ||
4600 | USA* | ||
6600 | USA* |
* uses the NEC
# uses the Canadian Electrical Code
Substantiation
General
NEC 2014 contains 317 sentences containing nominal. It contains 2744 sentences containing volts, voltage, or V. It is clear that the use of (or absence) nominal modifying voltage references follows no particular pattern. Having nominal appear and not appear with voltage references when nominal is the intention adds confusion and is in conflict with NEC_StyleManual_2011.pdf:
"3.3.5 Parallel Construction. Parallel construction means stating similar requirements in similar ways for greater consistency. This helps makes the NEC clear for users. Lack of consistency often creates confusion, causing users to ask: Does this difference in wording represent a different requirement? Or is it simply two different ways of trying to say the same thing?"
I suspect that nearly all, if not all, voltages are nominal voltages. It would be simpler to indicate that all voltages are nominal unless denoted actual and remove nominal from the text.
Specific
This submission emphasizes that nominal applies unless actual is specified, and adds a Table 110.4 Voltages. to correlate the voltages (nominal, device rating, and motor) that are equivalent. The table need some or all of the blank spaces filled in by someone to whom the expensive standards are available. The Country column may be deleted and "odd" voltages removed.
Several voltage systems are used in this Code are based on the ANSI-C84 standard, the NEMA device rating voltages, and motor ratings. It is appropriate to indicate that 115V, 120V and 125V and other pairings denote the same "nominal" circuit voltage.
Coordination
Inserted Deleted