725.136(I) ?

[mwm1752]

Can someone describe a situation in detail in which condition 1 is not achieved. I seem to have a thought block looking for a wiring method not within the parameters of "a raceway or in metal-sheathed, metal-clad, non?metallic-sheathed, or Type UF cables"

725.136 Separation from Electric Light, Power, Class 1, Non?Power-Limited Fire Alarm Circuit
Conductors, and Medium-Power Network
(I) Other Applications. For other applications, conductors of Class 2 and Clas s 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 network 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, metal-clad, non?metallic-sheathed, or Type UF cables.
(2) All of the electric light, power, 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, such as porcelain tubes or flexible tubing, in addition to the insulation on the conductors.

 

[MasterTheNEC]

Can someone describe a situation in detail in which condition 1 is not achieved. I seem to have a thought block looking for a wiring method not within the parameters of "a raceway or in metal-sheathed, metal-clad, non?metallic-sheathed, or Type UF cables"

725.136 Separation from Electric Light, Power, Class 1, Non?Power-Limited Fire Alarm Circuit
Conductors, and Medium-Power Network
(I) Other Applications. For other applications, conductors of Class 2 and Clas s 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 network 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, metal-clad, non?metallic-sheathed, or Type UF cables.
(2) All of the electric light, power, 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, such as porcelain tubes or flexible tubing, in addition to the insulation on the conductors.

Yes, the use of the NEW - MC-LED Cable from Encore Wire or MC Luminary Cable from AFC Cable. These products utilize the allowances of option 2. This permits the twisted 18 AWG, 600V rated, in a nonconductor binder which is the flexible tube (binder jacket) on the twisted paired conductors. For use with Smart Lighting Systems and Building Automation.

 

[mwm1752]

The 2" separation can be found in NEC 1975 Art. 800.3 and I'm intrested in a detailed example in which a wiring method creates a situation in which the separation is required.

 

[cadpoint]

The 2" separation can be found in NEC 1975 Art. 800.3 and I'm intrested in an example in which the separation is required.

All the local Universities are spastic about separation issues around here.

They have stated minimum box separation if boxes are on the same stud span bracket.

They love to have 1" pipe and 4-11/16" boxes for there telephone/CPU cable connections....

When running pipe the way to work with this is to have the Power at one height (out of wall) F/A at another and Telephone up to ceiling or at another height.

 

[jaggedben]

How about Knob and Tube?

Or lighting and power conductors improperly installed by others?

An AHJ might not hold you responsible for fixing those, but hold you responsible for keeping your new Class 2 and 3 conductors away from them.

 

[mwm1752]

How about Knob and Tube?

Or lighting and power conductors improperly installed by others?

An AHJ might not hold you responsible for fixing those, but hold you responsible for keeping your new Class 2 and 3 conductors away from them.

I thought of Knob & tube but it seems it would be classified as non-metallic covering (maybe at the Knob connection) -- Bare class 2/3 is the only instance I might consider -- There is a local inspector requiring the 2" separation in residential use ( nm, MC,UF,Raceways are a typical mix for light & power & typical class 2/3 rated cables) which in my opinion is an incorrect interpretation -- The lack of simple response is certainly a sign that my opinion may be correct. As for iterference static on communication lines it may be recommended but not mandated.