fmtjfw
Senior Member
- Location
- Fairmont, WV, USA
The NEC contains 2744 sentences that contain volt, voltage, and V. Some of the V are false positives (part V, Volume ...). 317 sentences contain nominal. The use of the word nominal does not appear to have a particular pattern when it is found in connection to voltage. Having some voltages marked as nominal and others not marked when both are intended to be nominal, leads to confusion
Some of the voltage references are for exact voltages. This is true for most "limit" specifications such as "the voltage shall not exceed 42.4 volts".
The specification of 600 volts, which is a utilization voltage, and 1000 volts, which is the "new" 600 volts, is problematical. I have chosen to treat these references as nominal.
I propose that the NEC indicate that all voltages listed in it are nominal, unless specifically marked actual This would rid the document of uncertainty as to whether or not a given voltage specification was actual or nominal.
Also add a table that indicates that the three groups of nominal voltages refer to the same thing: for instance 125/250 device rating, 120/240 load rating, and 115/230 motor rating.
The NEC contains the following different voltage references:
* occasionally marked nominal.
I propose the following steps:
Some of the voltage references are for exact voltages. This is true for most "limit" specifications such as "the voltage shall not exceed 42.4 volts".
The specification of 600 volts, which is a utilization voltage, and 1000 volts, which is the "new" 600 volts, is problematical. I have chosen to treat these references as nominal.
I propose that the NEC indicate that all voltages listed in it are nominal, unless specifically marked actual This would rid the document of uncertainty as to whether or not a given voltage specification was actual or nominal.
Also add a table that indicates that the three groups of nominal voltages refer to the same thing: for instance 125/250 device rating, 120/240 load rating, and 115/230 motor rating.
The NEC contains the following different voltage references:
| actual (exact) | nominal (utilization) | ||
|---|---|---|---|
8 10 12.4 15 21.2 24 24.8 30 42 42.4 50 60 65 80 100 132 150 200 300 301 350 600* 750 900 | 1080 1280 1530 2000* 2001 5000 15000 35000 50000 | 90 110 115 120 120/240 180 200 208 208Y/120 220 230 240 440 480 480Y/277 500 550 600 600Y/347 | 1000 2300 2400 4160 7200 7500 13800 14400 15000 23000 34500 46000 69000 115000 138000 230000 |
* occasionally marked nominal.
I propose the following steps:
[LI]Delete the word nominal together with comma(s) associated with it.[/LI]
[LI]Add definition Voltage, Actual indicating it means a precise value associated with a hard limit.[/LI]
[LI]Restore the nominals that were not associated with voltage.[/LI]
[LI]Insert actual modifying voltage as needed.