Branch Circuit Voltage Limitations
- Thread starter RasJuugie
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ryan_618
Senior Member
- Location
- Salt Lake City, Utah
Re: Branch Circuit Voltage Limitations
210.6(D) does not apply to 480. 210.6(C) applies, but it doesn't address your concern.
In my opinion, what you describe is perfectly fine.
210.6(D) does not apply to 480. 210.6(C) applies, but it doesn't address your concern.
In my opinion, what you describe is perfectly fine.
Re: Branch Circuit Voltage Limitations
210.6 (D) of the 2005 code applies to circuits not exceeding 600 volts between conductors, which a 480 volt circuit is. A 480 volt luminaire must be not less than a height of 22 ft. on poles and 18 ft on other structures such as tunnels.
If it is truely a sign that is being connected then it is covered by article 600, which has no input voltage limitations. But it requires an electric sign to be listed. If it is simply outline lighting for a sign, then the requirements of chapters 1 to 4 remain in effect and 210.6 still applies.
Fred Bender
210.6 (D) of the 2005 code applies to circuits not exceeding 600 volts between conductors, which a 480 volt circuit is. A 480 volt luminaire must be not less than a height of 22 ft. on poles and 18 ft on other structures such as tunnels.
If it is truely a sign that is being connected then it is covered by article 600, which has no input voltage limitations. But it requires an electric sign to be listed. If it is simply outline lighting for a sign, then the requirements of chapters 1 to 4 remain in effect and 210.6 still applies.
Fred Bender
pierre
Senior Member
- Location
- Westchester County, New York
Re: Branch Circuit Voltage Limitations
Derf
Sometimes we need to slow down when we read:
210.6
"(D) 600 Volts Between Conductors. Circuits exceeding 277 volts, nominal, to ground and not exceeding 600 volts, nominal, between conductors shall be permitted to supply the following:"
This typically may be a system of 600Y/347.
You can reference 220.5(A) in the '05, or 220.2(A) in the '02
You missed the portion that requires the circuit to exceed 277v to ground, which in most installation, the system/circuit wiring is 480Y/277 volts. So the 480 volts between conductors would generally not fall into subsection (D).
Derf
Sometimes we need to slow down when we read:
210.6
"(D) 600 Volts Between Conductors. Circuits exceeding 277 volts, nominal, to ground and not exceeding 600 volts, nominal, between conductors shall be permitted to supply the following:"
This typically may be a system of 600Y/347.
You can reference 220.5(A) in the '05, or 220.2(A) in the '02
You missed the portion that requires the circuit to exceed 277v to ground, which in most installation, the system/circuit wiring is 480Y/277 volts. So the 480 volts between conductors would generally not fall into subsection (D).
wirenut1980
Senior Member
- Location
- Plainfield, IN
Re: Branch Circuit Voltage Limitations
If you are talking about operating a 480 V circuit (phase to phase), then yes, no grounded conductor is required (or used), but the fact remains that the potential of an ungrounded conductor in that system to ground is still 277 V and will not fall under 210.6(D).
- Location
- Illinois
- Occupation
- retired electrician
Re: Branch Circuit Voltage Limitations
Dave,
If it is an ungrounded system, then Article 100 (Voltage to Ground) tells us that the voltage to ground is the same as the phase to phase voltage.
Don
Dave,
If it is an ungrounded system, then Article 100 (Voltage to Ground) tells us that the voltage to ground is the same as the phase to phase voltage.
Don
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