I am having trouble with the lack of info in 725 concerning class 1 circuits. The contractor is installing single pair 16awg shielded for a 10 watt solenoid on a gas skid. This circuit is part of a safety system. The solenoid is 10 watts at 120v and 1000 feet from a power source protected by a 15 amp fuse. I have always seen this application done using 14 awg or larger. The contractor is claiming that 725 covers the application. What part of 725 says this application is acceptable?
Class 1 Circuit
- Thread starter dmwyatt
- Start date
- Status
ryan_618
Senior Member
- Location
- Salt Lake City, Utah
Re: Class 1 Circuit
Article 725 permits different wiring methods for different applications. Class 1 circuits (generally speaking) require a chapter 3 wiring method, because they are not limitted energy. Class 2 and class 3 circuits are limitted energy, and from a shock and fire standpoint are considered safe. Because of this, lesser wiring methods are allowed for class 2 and class 3 circuits. You have a 120 volt circuit, which is not power limitted. Chapter 3 wiring methods would be required.
Remember that the power limititations are inherent in the power supply.
725.21
725.25
725.41
Take a look at table 11 for more info.
[ May 10, 2005, 01:02 PM: Message edited by: ryan_618 ]
Article 725 permits different wiring methods for different applications. Class 1 circuits (generally speaking) require a chapter 3 wiring method, because they are not limitted energy. Class 2 and class 3 circuits are limitted energy, and from a shock and fire standpoint are considered safe. Because of this, lesser wiring methods are allowed for class 2 and class 3 circuits. You have a 120 volt circuit, which is not power limitted. Chapter 3 wiring methods would be required.
Remember that the power limititations are inherent in the power supply.
725.21
725.25
725.41
Take a look at table 11 for more info.
[ May 10, 2005, 01:02 PM: Message edited by: ryan_618 ]
- Status