Heat trace

[hhsting]

I have 208V single phase 4kVA heat trace 19.2A full load. Breaker provided is 30A

Looked in NEC 2017 section 427.57 but its not clear and their is no other breaker sizing provided for heat trace.

19.2Ax1.25 = 24A next size would be 25A. However breaker provided is 30A.

Is their a section NEC 2017 for breaker sizing heat tracing?

 

[hillbilly1]

Don’t forget the gfep. Might be pretty hard to get a 25 amp gfep breaker.

 

[hhsting]

Don’t forget the gfep. Might be pretty hard to get a 25 amp gfep breaker.

What NEC 2017 section 427 is sizing of heat trace breakers? 427.57 is not that clear

 

[Rock86]

What NEC 2017 section 427 is sizing of heat trace breakers? 427.57 is not that clear

What's not clear about "...as specified in 210.20, 210.24"? you've already done the calculation to size the breaker. If the system is existing, and it is on a 30A breaker, than use 30A... that is acceptable.

 

[hhsting]

What's not clear about "...as specified in 210.20, 210.24"? you've already done the calculation to size the breaker. If the system is existing, and it is on a 30A breaker, than use 30A... that is acceptable.

System is new

 

[augie47]

Art 427 s references the branch circuit. With a 24 amp calculated load, the 30 amp breaker seems reasonable. I wouldn't question it.

 

[hhsting]

Art 427 s references the branch circuit. With a 24 amp calculated load, the 30 amp breaker seems reasonable. I wouldn't question it.

19.2A is the calculated load and 24A is demand load taking in consideration heat trace is continuous load. How can you not question next size is 25A not 30A?

 

[augie47]

It's supplied with a 30. I see nothing in the Code that prohibits a 30 (most heating equipment is allowed up to 150% of load).
If it gives you a warm fizzy feeling to pursue it, go back to the manufacturer and see if they have any input.
From my standpoint, I can't see where it's a violation so if I was inspecting it I'd have no problem.

 

[Dsg319]

I have 208V single phase 4kVA heat trace 19.2A full load. Breaker provided is 30A

Looked in NEC 2017 section 427.57 but its not clear and their is no other breaker sizing provided for heat trace.

19.2Ax1.25 = 24A next size would be 25A. However breaker provided is 30A.

Is their a section NEC 2017 for breaker sizing heat tracing?

What size branch circuit conductors are supplying the heat trace?

When you say you have 4KVA heat trace what do you mean? After the total amount of footage of the heat trace you end up with 4KVA?

 

[hhsting]

What size branch circuit conductors are supplying the heat trace?

When you say you have 4KVA heat trace what do you mean? After the total amount of footage of the heat trace you end up with 4KVA?

#10 awg and heat trace is 4kva after total amount of footage


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[electrofelon]

19.2A is the calculated load and 24A is demand load taking in consideration heat trace is continuous load. How can you not question next size is 25A not 30A?

Contrary to what you might think, there is no general rule to use as small an OCPD as possible. The OCPD is generally there to protect the wire. If the NEC doesn't require a specific ocpd for certain piece of equipment, and the manufacturer doesn't give any requirement, then you can do as you wish.

 

[Dsg319]

Contrary to what you might think, there is no general rule to use as small an OCPD as possible. The OCPD is generally there to protect the wire. If the NEC doesn't require a specific ocpd for certain piece of equipment, and the manufacturer doesn't give any requirement, then you can do as you wish.

That’s the way I look at it, unless the manufacture says do not exceed such amount, or max OCPD size to be used. As long as your branch circuit conductors are protected correctly I think you should be good to go. Any oppositions?