Question about QMark MUH-35 Heater

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MUH108 I have a MUH108, single phase heater. Need to confirm the wire & breaker size? The PDF says a 4awg wire, but only 48 amps? That seems awful big on the wire in relationship to the breaker? Please help!

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4awg is about the size of battery jumper cable. or 240v multi-strend cable. and 48A is big. double 40A brakers.
the heater is 208v 3-phase 34,000BTU
it is call out to use the 240 comercial wiring.

Posted on Dec 02, 2008

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Posted on Jan 02, 2017

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The wire in my house for an elec. garage heater is 14 gauge wire with a 15 amp breaker. I assume i need at least 10 gauge wire with 20 amp .The heater is 20.9 amps and 3000-5000 watts, with 17500 BTUs


Curt, a 20 amp breaker will blow if you pull 10.9 amps from it. I suggest having a licensed electrician do your wiring. Likely, you need a permit anyway.

Oct 22, 2015 | Water Heaters

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I have 110 volts n each leg but not 220 across both why??


In a traditional North American residential electrical panel (120/240 volt, single phase), installing a single width or single pole circuit breaker, you would expect to read 120 volts from the breaker terminal screw to either ground or neutral. A double width or double pole breaker would provide 120 volts from either of the breaker terminal screws to ground or neutral AND it will provide 240 volts BETWEEN the TWO breaker terminals.

A single-width circuit breaker case that contains two handles is NOT a two pole circuit breaker (these are called "tandem" or "1/2 size" breakers). This is because a single width breaker engages only one "line" in the panel. A double width breaker will engage 2 "lines" as a triple width breaker would engage 3 "lines" of a 3 phase panel. A single wide breaker can not physically engage more than 1 "line" so it will never be able to pass 240 volts.

You must install a double width / double pole breaker to safely supply a 240 volt circuit / device.

Mar 15, 2014 | GE 20 Amp 1 In Double Pole Circuit Breaker...

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Installation: Electrical Requirements


13Mb product manual is a big download ... electrical info page 13:
http://waterheatertimer.org/pdf/AO-Smith-Cyclone-gas-water-heater.pdf
http://waterheatertimer.org/pdf/AO-Smith-Cyclone-electrical-connection.pdf
Recommended both water heaters require dedicated single-phase 15 amp 120Volt line with correct polarity. This is 14 gauge wire and 15 amp breaker for each unit.
I would put both water heaters on surge protection and GFCI. Most water heaters are not protected from surge, and manual says line noise can affect operation of water heater.
Your local code would say if GFCI is required. Install GFCI breaker in main panel if required.
Install inline surge protector: Or add main breaker box protection.
http://www.amazon.com/dp/B003AU0Z48/?tag=waterheaterti-20

AO Smith service handbooks:
http://www.hotwater.com/resources/product-literature/service-handbooks/
Add a comment and say what you discover

May 17, 2013 | A.O. Smith BTH-199 BTH-199 100 Gallon...

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Need information on circuit breaker BR2100 60amp


Hi - I'm an electrician and can help you with your question.

A BR2100 circuit breaker is a 2 Pole 100 Amp (for the part number "BR2100", the "2" indicates the number of poles and the "100" indicates the amperage) circuit breaker. It can be installed in a single phase or three phase 120/240 VAC system panel that specifically lists the BR series breakers as acceptable for use.

A BR260 A BR2100 circuit breaker is a 2 Pole 60 Amp (the part number BR260, the "2" indicates the number of poles and the "60" indicates the amperage) circuit breaker. It can be installed in a single phase or three phase 120/240 VAC system panel that specifically lists the BR series breakers as acceptable for use.

It is not possible to have a BR2100 rated for 60 amps, 1 or 3 poles, or a BR260 rated for 100 amps, 1 or 3 poles.

It is not permissible to install any circuit breaker brand or type in any panel that does not specifically include it on a list of acceptable circuit breakers.

Circuit breakers are designed to carry 80% of the amperage rating.
To determine the load a circuit breaker can carry, multiply the circuit breaker amp rating by 80%.
This means that if you need to supply more than 80 amps, you cannot use a 100 amp circuit breaker. A higher rating is required. A BR2110 would be acceptable for loads greater than 80 amps, but less than 88 amps because the formula above says: 110 amp x 80% = 88 amps.

To determine the breaker size, determine the load (by measuring with a meter or obtaining amp rating of the load from the data plate) and multiply it by 125%. Using the same numbers in the example above; assume an 88 amp load. 88 amps x 125% = 110 amp circuit breaker. The 60 amp breaker is acceptable for up to 48 amps because 60amps x 80% = 48 amps. A 48 amp load needs a 60 amp breaker because 48 amps x 125% = 60 amps.

I hope this helps and good luck!

Jan 15, 2013 | Eaton Corporation BR2100 Circuit Breaker

1 Answer

Muh108 single phase what size breaker to use 40 or 50 amp


IF it is 10KW at 208 single phase it should be on a 60 Amp breaker.
3 Phase would be 35 Amps. Always check the nameplate for additional information. It may be configurable for different voltages. Best to check manufacturers data if available.

Mar 05, 2011 | QMark MUH-35 Heater

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I have a new ingersol rand 80 gal 7.5hp air compressor 230volt single phase and was wondering what size breaker it needs to be put on


Your owners manual spec sheet should give you that answer. However since that unit at max loads should pull 32 to 35 amps I recommend 1.5 times max amps. So approximately a 50 amp breaker. This all based on standard wire size and length of wire run. Also when checking your voltage at load you should be showing 235 to 240 volts.

Jan 09, 2011 | Ingersoll Rand - Rand Type - 30...

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Need instructions on how to install a 750W Fahrenheat heater. Wire size, breaker size, etc.


Hi,
To know what to tell you you need to know if it is 1 phase or 3 phase and what the voltage is that it will be running on...

Assuming that it is 240v 1 phase current you will need at least a 40 amp 2 pole breaker and #8 wire for a distance of upto about 100 ft. if longer then you need to go up to #6 wire....

7500 watts / 240v equals 31.25 amps... so a thirty to too small and you will need the 40....

Wire sizing needs to go larger as the run gets longer...

heatman101

Dec 13, 2010 | Fahrenheat Ceiling-Mount Industrial Heater...

1 Answer

I have a new water heater, and the hook up terminals are labled 1-2-3 are they hooked the same as in the panel 1-2-3 ?


No. You have to find out if you have 3 phase or single phase power. If this is a new unit you will find a wiring diagram inside the front cover. 3 phase power has 3 "hot" wires. Single phase has 2 "hot" wires. There is a big difference when you hook it up wrong. I don't know if this is a new installation or if you are replacing an old one. The terminals are numbered for 3 phase. If you look in your breaker box, 3 phase 208 will haven a breaker with 3 spaces hooked together by one bar. Single phase will have two spaces hooked together by a bar. So if the breaker kicks out it will flip all 3 space on 3 phase or 2 spaces on single phase. If you already have wires to the location of the booster heater, you may have to use single phase if that is all that is at that location. If you have single phase power you will have to look at the wiring diagram and you will see the terminal block represented for both single and 3 phase. Normally running from the terminal block will be six wires marked 1 through 6. The wireing diagram will say something like "for single phase put 1,3,5 on terminal 1 and 2,4,6 on terminal 3. Leave terminal 2 out all together. Of course at this point your 2 hot wires will go to terminal 1 and 3. There are other considerations as well. With 3 phase the circuit wires will be smaller gauge and may not carry the current you need for single phase. This is a booster heater. You need to hook up your hot water line to go into the heater and the boosted hot water to your appliance. It will not work to heat your water for other purposes. It is meant to take 140 degree water and boost it to 190 degrees. Good luck, hope this helps

Sep 11, 2010 | Hatco Corporation Compact Electric Booster...

1 Answer

How to calculate cable size


This site may help. Plug in all the information about your load requirements and it will figure out wire and breaker size and even how big a conduit you'd need for the run.

Jun 02, 2009 | Texas Instruments TI-84 Plus Calculator

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