Cable run

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siva

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Hi all
Can I run 230V wires(Insulation rating is 600 V)and 24 volt thermostat wire (insulation rating is 300 v) in same conduit?

Thanks
Siva
 

iwire

Moderator
Staff member
Location
Massachusetts
Re: Cable run

Yes if you then use class 1 wiring methods for all of the class 2 conductors (the thermostat wires).

In other words the entire thermostat run will need to be in NM, MC, raceway etc and a box will need to be placed for the thermostat.

Article 725 is where you want to look.

Specifically 2002 NEC
725.52(A)Exception No. 2: Class 2 and Class 3 circuits shall be permitted to be reclassified and installed as Class 1 circuits if the Class 2 and Class 3 markings required in 725.42 are eliminated and the entire circuit is installed using the wiring methods and materials in accordance with Part II, Class 1 circuits. Class 2 and Class 3 circuits reclassified and installed as Class 1 circuits shall not be classified as Class 2 or Class 3 circuits, regardless of the continued connection to a Class 2 or Class 3 power source.

[ December 19, 2004, 07:47 AM: Message edited by: iwire ]
 
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