J) Other Applications 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 or medium power
network-powered broadband communications circuits unless
one of the following conditions is met:
(1) Either (a) all of the electric light, power, Class 1,
non?power-limited fire alarm and medium power net-
work-powered broadband communications circuit conductors
or (b) all of the Class 2 and Class 3 circuit
conductors are in a raceway or in metal-sheathed, metalclad,
non?metallic-sheathed, or Type UF cables.
(2) All of the electric light, power, Class 1 non?powerlimited
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, such as porcelain tubes or flexible tubing,
in addition to the insulation on the conductors.