HVAC / Electrical

[FEDS79]

Refrigerant line and electrical line can be ran in same roof flashing?
Nec 110.26(F)(1)(b)
AHJ decides?
Can there be a code violation?

 

[FEDS79]

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According to NEC 2017 Code Changes Chapter 3, raceways or cable trays containing electrical conductors can't contain any pipes, tubes, or other systems for air, gas, water, steam, drainage, or other services.

 

[LarryFine]

Refrigerant line and electrical line can be ran in same roof flashing?

Welcome to the forum.

I don't know what you mean by running lines in roof flashing.

A channel or tube to hide lines is not a raceway or cable tray.

 

[Dennis Alwon]

There is not a code violation as long as the electrical raceway is not compromised

 

[infinity]

For flat roofs these are called pitch pockets and yes everything associated with the unit can go through the same penetration.

 

[FEDS79]

 

[LarryFine]

That is not an electrical raceway. Definitely okay for all power and service lines to share.

 

[FEDS79]

Thank you all for the input.

 

[FEDS79]

NEC definition of "raceway " and "enclosed " contradict allowance with refrigerant lines....

 

[kwired]

Raceway's enclose conductors.

A sleeve, chase, etc. that contains a raceway (with conductors within) and refrigerant lines is no different than having same raceway and refrigerant lines in same stud bay in a wall.

 

[infinity]

NEC definition of "raceway " and "enclosed " contradict allowance with refrigerant lines....

They do not because you're not installing the refrigerant lines within the raceway. The refrig lines and the electrical raceway are separate but run through the same pitch pocket penetration.

 

[garbo]

We were taught to try to keep conduits, sealtite, cables etc at least one inch from all foriegn pipe runs. A conduit in direct contact with a refrigerant line that could be hot exiting a hot roof might damage conductors inside of a conduit.

 

[kwired]

We were taught to try to keep conduits, sealtite, cables etc at least one inch from all foriegn pipe runs. A conduit in direct contact with a refrigerant line that could be hot exiting a hot roof might damage conductors inside of a conduit.

so keep some separation within the sleeve or in this case pitch pocket.

refrigerant lines in this situation don't normally get hot enough to be a problem though. Line between compressor and condenser possibly could be, but that line is within the unit and not run between units in a typical split system.

 

[FEDS79]

Much appreciated for all input

 

[Eddie702]

And the refrigerant lines are usually insulated even the "hot" liquid line is usually insulated.

 

[drcampbell]

... the "hot" liquid line is usually insulated.

Only by people who don't know what they're doing. Any opportunity for the hot liquid to lose heat would be a good thing.

 

[LarryFine]

Only by people who don't know what they're doing. Any opportunity for the hot liquid to lose heat would be a good thing.

Why are the tube diameters and the expansion valve not issues when heat-pumping?

 

[drcampbell]

Why are the tube diameters and the expansion valve not issues when heat-pumping?

Who ever said they're not?

In a heat pump, the refrigerant flow reverses from winter to summer, and each tube needs to be big enough for the (low density) cold vapor, without excessive pressure drop.

 

[Galt]

If your liquid line is hot you need to clean your condenser.

 

[LarryFine]

When cooling, like now, the liquid line at the AH is barely warm, and the suction line is very cold.

I thought the hot line meant that's how much heat was being removed from the airflow.