[mreev90]

Hi All, I have a question maybe you guys can easily answer. I have purchased a Hubbell Electric Booster Heater for a commercial dishwasher. I am getting ready to run the branch circuit to supply power to the Water Heater. I pulled the following screenshot from the Owners Manual. The model that I have is the 240VAC 1PH 12KW highlighted below. I noticed that in the table they call for #6 wiring, 3/4" conduit and a 65A breaker. I have always thought that a branch circuit with #6 wire could be protected by a maximum of 60A breaker. Are their specs correct as far as NEC is concerned or should I go with #4 wiring for the 65A breaker?

 

[Wirenuting]

Are you an electrician

 

[u2slow]

Fwiw, wire/cable temperature ratings and ampacities aren't universally the same across all jurisdictions. Also have to obey termination temperature ratings.

This concludes today's lesson of Electrical 101.

 

[CAUSA]

Fwiw, wire/cable temperature ratings and ampacities aren't universally the same across all jurisdictions. Also have to obey termination temperature ratings.

This concludes today's lesson of Electrical 101.

A question.

I am out of my element with acronyms.

What is Fwiw?

 

[Ostrich Society]

A question.

I am out of my element with acronyms.

What is Fwiw?

No to get too technical but I’m pretty sure FWIW is an initialism. “For what it’s worth”.

An acronym is an abbreviation that you can pronounce as a single word. Like Laser or potus for example.

😀

 

[Awg-Dawg]

#6 is good for 65a, 50a x 1.25 is 62.5, so it’s good. The 65a breaker is the same math.

You might be thinking 240.4(d), it applies to small conductors.

 

[CAUSA]

No to get too technical but I’m pretty sure FWIW is an initialism. “For what it’s worth”.

An acronym is an abbreviation that you can pronounce as a single word. Like Laser or potus for example.

😀

like NASA same as FWIW..... That is a acronym.

Thanks for the FWIW meaning.

 

[kb1jb1]

Is that chart correct? Is this just a heating element? A resistive heating element has a fixed resistance so if you lower the voltage the amperage will also be lower.

 

[EMTDOG]

Hi All, I have a question maybe you guys can easily answer. I have purchased a Hubbell Electric Booster Heater for a commercial dishwasher. I am getting ready to run the branch circuit to supply power to the Water Heater. I pulled the following screenshot from the Owners Manual. The model that I have is the 240VAC 1PH 12KW highlighted below. I noticed that in the table they call for #6 wiring, 3/4" conduit and a 65A breaker. I have always thought that a branch circuit with #6 wire could be protected by a maximum of 60A breaker. Are their specs correct as far as NEC is concerned or should I go with #4 wiring for the 65A breaker?

View attachment 174537

65 amps is not a standard size breaker!

 

[kb1jb1]

65 amps is not a standard size breaker!

That is what I thought but Amazon will sell anything.

 

[emtnut]

Both Eaton and Siemens make them.

Either way, MIN 65A breaker ... so what do you do ??

 

[mreev90]

Is that chart correct? Is this just a heating element? A resistive heating element has a fixed resistance so if you lower the voltage the amperage will also be lower.

That is correct EMTDOG. This is simply a water heater with a constant resistance heating element. There would be no startup load like a motor or compressor would have. Since the heater is 12KW and assuming the voltage is 240V the current would be right at 50A. The run is also relatively short as it is ~25 ft from the service panel. I just thought the #6 awg wiring was a little borderline for a 65A breaker. I suppose what some are saying here is that a constant draw of 50A is certainly OK for #6 wire and a 65A breaker will prevent any overheating or frying of the wire should an overload condition occur. Does that make sense?

 

[kb1jb1]

Look at the amps for 240 volts and then look at the amps for 208 vols. The amps for 208 volts is higher which makes me think the chart is not right. That is if I am reading it correctly.

 

[u2slow]

Look at the amps for 240 volts and then look at the amps for 208 vols. The amps for 208 volts is higher which makes me think the chart is not right. That is if I am reading it correctly.

They're listing lower resistance elements on the 208 single-phase.

 

[power]

This can be WAY overthought!

Totally forget the idea of 65amp.

Simply put, install 2 x #6 CU conductors in a ¾" raceway, +gnd when in flex, put them on a 2-pole 60 brkr.

Unlike motor loads, how water booster's FLA do not fluctuate.

 

[paulengr]

Is that chart correct? Is this just a heating element? A resistive heating element has a fixed resistance so if you lower the voltage the amperage will also be lower.

At least NEC uses nominal (ANSI) voltages. Listing standards test at alternate conditions so as long as you follow that (such as +10%/-15% so normally you can ignore this.

 

[CoreyOnTheBrink]

Are they trying to avoid loading the breaker past 80%? I think I’m with power’s recommendation - run #6 and put it on a 60amp

 

[Ostrich Society]

like NASA same as FWIW..... That is a acronym.

Thanks for the FWIW meaning.

No worries. wasn’t trying to be a prick about the types of acronyms either, just point out an interesting grammatical terminology.

 

[kb1jb1]

They're listing lower resistance elements on the 208 single-phase.

Makes sense. I guess they build them individually rather than a standard element like ranges and electric baseboard heat..

 

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