Coppersmith
Senior Member
- Location
- Tampa, FL, USA
- Occupation
- Electrical Contractor
I'm a little unclear concerning 725.136.
I have two class 2 circuits, five electric power circuits, a class 2 transformer, and two relays in an enclosure. The class 2 circuits are controlling the electric power circuits through the relays. The transformer is powering the class 2 circuits.
Am I correct in saying I don't have to a barrier between the class 2 circuits and the power circuits per (B) since these circuits are associated? (D)(1) says they only have to be separated by 1/4" (free air I assume). It wasn't clear if both applied.
Bonus question: I'm using RIB relays. The class 2 and power circuits all emerge from one 1/2" nipple. I can separate them quickly but they come closer than 1/4" as they enter the box. 725.136(E) says this is OK as long as there is tubing separating them, but there is not. Is this a problem?
725.136 Separation from Electric Light, Power, Class 1,
Non–Power-Limited Fire Alarm Circuit Conductors,
and Medium-Power Network-Powered Broadband
Communications Cables.
(A) General. Cables and conductors of Class 2 and Class 3
circuits shall not be placed in any cable, cable tray, compartment,
enclosure, manhole, outlet box, device box, raceway,
or similar fitting with conductors of electric light,
power, Class 1, non–power-limited fire alarm circuits, and
medium-power network-powered broadband communications
circuits unless permitted by 725.136(B) through (I).
(B) Separated by Barriers. Class 2 and Class 3 circuits
shall be permitted to be installed together with the conductors
of electric light, power, Class 1, non–power-limited fire
alarm and medium power network-powered broadband communications
circuits where they are separated by a barrier.
(D) Associated Systems Within Enclosures. Class 2 and
Class 3 circuit conductors in compartments, enclosures, device
boxes, outlet boxes, or similar fittings shall be permitted
to be installed with electric light, power, Class 1, non–
power-limited fire alarm, and medium-power network powered
broadband communications circuits where they
are introduced solely to connect the equipment connected
to Class 2 and Class 3 circuits, and where (1) or (2) applies:
(1) The electric light, power, Class 1, non–power-limited fire
alarm, and medium-power network-powered broadband
communications circuit conductors are routed to maintain
a minimum of 6 mm (0.25 in.) separation from the conductors
and cables of Class 2 and Class 3 circuits.
I have two class 2 circuits, five electric power circuits, a class 2 transformer, and two relays in an enclosure. The class 2 circuits are controlling the electric power circuits through the relays. The transformer is powering the class 2 circuits.
Am I correct in saying I don't have to a barrier between the class 2 circuits and the power circuits per (B) since these circuits are associated? (D)(1) says they only have to be separated by 1/4" (free air I assume). It wasn't clear if both applied.
Bonus question: I'm using RIB relays. The class 2 and power circuits all emerge from one 1/2" nipple. I can separate them quickly but they come closer than 1/4" as they enter the box. 725.136(E) says this is OK as long as there is tubing separating them, but there is not. Is this a problem?
725.136 Separation from Electric Light, Power, Class 1,
Non–Power-Limited Fire Alarm Circuit Conductors,
and Medium-Power Network-Powered Broadband
Communications Cables.
(A) General. Cables and conductors of Class 2 and Class 3
circuits shall not be placed in any cable, cable tray, compartment,
enclosure, manhole, outlet box, device box, raceway,
or similar fitting with conductors of electric light,
power, Class 1, non–power-limited fire alarm circuits, and
medium-power network-powered broadband communications
circuits unless permitted by 725.136(B) through (I).
(B) Separated by Barriers. Class 2 and Class 3 circuits
shall be permitted to be installed together with the conductors
of electric light, power, Class 1, non–power-limited fire
alarm and medium power network-powered broadband communications
circuits where they are separated by a barrier.
(D) Associated Systems Within Enclosures. Class 2 and
Class 3 circuit conductors in compartments, enclosures, device
boxes, outlet boxes, or similar fittings shall be permitted
to be installed with electric light, power, Class 1, non–
power-limited fire alarm, and medium-power network powered
broadband communications circuits where they
are introduced solely to connect the equipment connected
to Class 2 and Class 3 circuits, and where (1) or (2) applies:
(1) The electric light, power, Class 1, non–power-limited fire
alarm, and medium-power network-powered broadband
communications circuit conductors are routed to maintain
a minimum of 6 mm (0.25 in.) separation from the conductors
and cables of Class 2 and Class 3 circuits.
