De acordo com o National Electrical Code. Você só pode executar circuitos de comunicação no conduíte com condutores de energia elétrica, se eles estiverem separados por uma barreira permanente e listada (800.133 (A) (1) (d) Ex. 1, 830.133 (A) (1) (f) Ex.1).
Com alguns circuitos de comunicação, você pode executá-los no mesmo conduíte se todos os condutores forem capazes de controlar a voltagem máxima no conduíte (800.133 (A) ( 1) (d) Ex.3).
Isso reduz as chances de circuitos de energia elétrica energizarem condutores de comunicação. isto é, reduzir as hipóteses de um curto-circuito entre um condutor de tensão de rede e condutores de comunicações. Você não gostaria de estar derrubando um cabo de rede e, de repente, ser sacudido por 120-240 volts. Se ocorrer uma falha, a tensão da rede elétrica através de um condutor de comunicação pode resultar em aquecimento perigoso.
National Electrical Code 2014
Chapter 8 Communications Systems
Article 800 Communications Circuits
800.133 Installation of Communications Wires, Cables,
and Equipment.
(A) Separation from Other Conductors.
(1) In Raceways, Cable Trays, Boxes, Cables, Enclosures
and Cable Routing Assemblies.
(d) Electric Light, Power, Class 1, Non–Power-Limited
Fire Alarm, and Medium-Power Network-Powered Broadband
Communications Circuits in Raceways, Compartments,
and Boxes. Communications conductors shall not be
placed in any raceway, compartment, outlet box, junction
box, or similar fitting with conductors of electric light,
power, Class 1, non–power-limited fire alarm, or mediumpower
network-powered broadband communications circuits.
Exception No. 1: Where all of the conductors of electric
light, power, Class 1, non–power-limited fire alarm, and
medium-power network-powered broadband communications
circuits are separated from all of the conductors of
communications circuits by a permanent barrier or listed
divider.
Exception No. 3: As permitted by 620.36.
Article 830 Network-Powered Broadband Communications Systems
830.133 Installation of Network-Powered Broadband
Communications Cables and Equipment.
(A) Separation of Conductors.
(1) In Raceways, Cable Trays, Boxes, Enclosures and
Cable Routing Assemblies.
(f) Electric Light, Power, Class 1, Non–Powered Broadband
Communications Circuit Cables. Network-powered
broadband communications cable shall not be placed in any
raceway, cable tray, compartment, outlet box, junction box,
or similar fittings with conductors of electric light, power,
Class 1, or non–power-limited fire alarm circuit cables.
Exception No. 1: Where all of the conductors of electric
light, power, Class 1, non–power-limited fire alarm circuits
are separated from all of the network-powered broadband
communications cables by a permanent barrier or listed
divider.