vault backup: 2025-11-10 16:55:49

nfpa-70_725_control-circuits.md

@@ -9,9 +9,9 @@ tags:
   - status/incomplete
   - topic/construction/electrical
   - type/media
-title: "NEC Article 725: Class 1, Class 2, and Class 3 Remote-Control, Signaling, and Power-Limited Circuits"
+title: NEC Article 725 Class 1, Class 2, and Class 3 Remote-Control, Signaling, and Power-Limited Circuits
 ---
-# NEC Article 725: Class 1, Class 2, and Class 3 Remote-Control, Signaling, and Power-Limited Circuits
+# NEC Article 725 Class 1, Class 2, and Class 3 Remote-Control, Signaling, and Power-Limited Circuits
 
 ## Part I. General
 
@@ -29,27 +29,27 @@ The definitions in this section shall apply only within this article.
 
 ## Part III. Class 2 and Class 3 Circuits
 
-### 725.136 Separation from Electric Light, Power, Class 1, Non–Power-Limited Fire Alarm Circuit
+### 725.136 Separation from Electric Light, Power, Class 1, Non--Power-Limited Fire Alarm Circuit
 
 Conductors, and Medium-Power Network-Powered Broadband Communications Cables.
 
 #### 725.136(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).
+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).
 
 #### 725.136(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.
+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.
 
 #### 725.136(C) Raceways Within Enclosures.
 
-In enclosures, Class 2 and Class 3 circuits shall be permitted to be installed in a raceway to separate them from Class 1, non–power-limited fire alarm and medium-power network-powered broadband communications circuits.
+In enclosures, Class 2 and Class 3 circuits shall be permitted to be installed in a raceway to separate them from Class 1, non--power-limited fire alarm and medium-power network-powered broadband communications circuits.
 
 #### 725.136(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 instal led 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:
+Class 2 and Class 3 circuit conductors in compartments, enclosures, device boxes, outlet boxes, or similar fittings shall be permitted to be instal led 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.
+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.
 
 2. The circuit conductors operate at 150 volts or less to ground and also comply with one of the following:
 
@@ -59,14 +59,14 @@ Class 2 and Class 3 circuit conductors in compartments, enclosures, device boxes
 
 #### 725.136(E) Enclosures with Single Opening.
 
-Class 2 and Class 3 circuit conductors entering compartments, enclosures, device boxes, outlet boxes, or similar fittings shall be permitted to be instal led with 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. Where Class 2 and Class 3 circuit conductors must enter an enclosure that is provided with a single opening, they shall be permitted to enter through a single fitting (such as a tee), provided the conductors are separated from the conductors of the other circuits by a continuous and firmly fixed nonconductor, such as flexible tubing.
+Class 2 and Class 3 circuit conductors entering compartments, enclosures, device boxes, outlet boxes, or similar fittings shall be permitted to be instal led with 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. Where Class 2 and Class 3 circuit conductors must enter an enclosure that is provided with a single opening, they shall be permitted to enter through a single fitting (such as a tee), provided the conductors are separated from the conductors of the other circuits by a continuous and firmly fixed nonconductor, such as flexible tubing.
 
 #### 725.136(F) Manholes.
 
-Underground Class 2 and Class 3 circuit conductors in a manhole shall be permitted to be installed with Class 1, non–power-limited fire
+Underground Class 2 and Class 3 circuit conductors in a manhole shall be permitted to be installed with Class 1, non--power-limited fire
 alarm and medium-power network-powered broadband communications circuits where one of the following conditions is met:
 
-1. The electric light, power, Class 1, non–power-limited fire alarm and medium-power network-powered broadband communications circuit conductors are in a metal-enclosed cable or Type UF cable.
+1. The electric light, power, Class 1, non--power-limited fire alarm and medium-power network-powered broadband communications circuit conductors are in a metal-enclosed cable or Type UF cable.
 
 2. The Class 2 and Class 3 circuit conductors are permanently and effectively separated from the conductors of other circuits by a continuous and firmly fixed nonconductor, such as flexible tubing, in addition to the insulation or covering on the wire.
 
@@ -74,7 +74,7 @@ alarm and medium-power network-powered broadband communications circuits where o
 
 #### 725.136(G) Cable Trays.
 
-Class 2 and Class 3 circuit conductors shall be permitted to be installed in cable trays, where the conductors of the electric light, Class 1, and non–power-limited fire alarm circuits are separated by a solid fixed barrier of a material compatible with the cable tray or where the Class 2 or Class 3 circuits are installed in Type MC cable.
+Class 2 and Class 3 circuit conductors shall be permitted to be installed in cable trays, where the conductors of the electric light, Class 1, and non--power-limited fire alarm circuits are separated by a solid fixed barrier of a material compatible with the cable tray or where the Class 2 or Class 3 circuits are installed in Type MC cable.
 
 #### 725.136(H) In Hoistways.
 
@@ -86,19 +86,19 @@ For other applications,
 conductors of Class 2 and Class 3 circuits
 shall be separated by at least 50 mm (2 in.)
 from conductors of any electric light, power,
-Class 1 non–power-limited fire alarm
+Class 1 non--power-limited fire alarm
 or medium power network-powered broadband communications circuits
 unless one of the following conditions is met:
 
 1. Either all of the electric light, power,
-  Class 1, non–power-limited fire alarm
+  Class 1, non--power-limited fire alarm
   and medium-power network-powered broadband communications circuit conductors
   or all of the Class 2 and Class 3 circuit conductors
   are in a raceway or in metal-sheathed, metal-clad,
-  non–metallic-sheathed, Type TC, or Type UF cables
+  non--metallic-sheathed, Type TC, or Type UF cables
 
 2. All of the electric light, power,
-  Class 1 non–power-limited fire alarm,
+  Class 1 non--power-limited fire alarm,
   and medium-power network-powered broadband communications circuit conductors
   are permanently separated from all of the Class 2 and Class 3 circuit conductors
   by a continuous and firmly fixed nonconductor,