Code Question

[Witeman]

I notice that most HVAC techs attach the line voltage cable that runs from the inside head to the outside unit on a mini-split application to the line set that goes from the inside head to the outside unit with wire ties or tape. My question is does this violate the NEC 2020 code in any way?

 

[augie47]

300.11 (C) would not allow it unless it was a Class 2 cable {(300.11(C)(2)}. Line voltage, I beleieve, would normally be Class 1.

 

[Witeman]

Thanks
lf this Is considered a branch circuit as it is line voltage from the inside head to the outside unit and the cable is very similar to non metallic cable 334.30 rules would apply.

 

[david luchini]

Thanks
lf this Is considered a branch circuit as it is line voltage from the inside head to the outside unit and the cable is very similar to non metallic cable 334.30 rules would apply.

I don't think the interconnecting cable would be branch circuit wiring.

 

[Dennis Alwon]

Normal T-stat wire is not rated to be run exposed outdoors.

 

[electrofelon]

300.11 (C) would not allow it unless it was a Class 2 cable {(300.11(C)(2)}. Line voltage, I beleieve, would normally be Class 1.

I'm not sure how that would apply Augie..... unless the CABLE is supporting the line set?

 

[LarryFine]

Normal T-stat wire is not rated to be run exposed outdoors.

Yet I see it all the time, usually taped to the refrigerant lines.

 

[mtnelect]

The refrigerant and control lines exiting the structure now have to be sunlight resistant or protected against UV per Title 24.

 

[mtnelect]

See attachment.

 

[electrofelon]

The refrigerant and control lines exiting the structure now have to be sunlight resistant or protected against UV per Title 24.

May I suggest you add "in California" to such responses. Many of us are not from CA and don't know what title 24 is.

 

[wwhitney]

May I suggest you add "in California" to such responses. Many of us are not from CA and don't know what title 24 is.

And Title 24 in CA is actually the entire building code. The term has just become slang for Title 24, Part 6, which is the Energy Code.

Cheers, Wayne

 

[mtnelect]

The 2012 & 2015 International Energy Conservation Code (IECC) also has similar requirements, since this forum has a wider audience I will quote other codes when possible.
- Residential Section R403.3.1 (2012), R403.4.1 (2015)
- Commercial Section C403.2.8.1 (2012) C403.2.10.1 (2015)
Protection of Piping Insulation:
Piping insulation exposed to weather shall be protected from damage, including that due to sunlight, moisture, equipment maintenance, wind and shall provide shielding from solar radiation that can cause degradation of the material. Adhesive tape shall not be permitted.

California's Title 24 is now included in other national codes.

 

[mtnelect]

This is the cable that "Diakin" ductless units uses to connect the inside unit with the outside unit that is routed with the refrigerant lines.

 

[kwired]

The refrigerant and control lines exiting the structure now have to be sunlight resistant or protected against UV per Title 24.

We were getting correction notices ~30 years ago for not using sunlight resistant control cable, as well as if not using sunlight resistant cable ties to secure it.