Yesterday, 08:20 PM
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Newbie ?Join Date: Feb 2012 Posts: 2 |
I am about to run wire for 8kw double oven, 120/240 4 wires, 80 feet one way. instruction says 'protection circuit recommended 40A'. However, i want to double check with calculation. not sure which method to use or none at all.  method A 50 amp breaker x .8 = 40 amp limit. method B method C, no calculation needed, variance already built in??? |
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Yesterday, 08:47 PM
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Master Electrician ?Join Date: Mar 2010 Location: Indiana Posts: 1,759 |
A range is NOT a continuous load. 40 amps is correct. |
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Yesterday, 08:53 PM
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" Euro " electrician ?Join Date: Apr 2006 Location: WI & France { in France for now } Posts: 3,706 |
Moi aussi 2X as above not a contionous load at all. Just wired 8-3 avce 40 amp breaker and be done with it. Just be aware of junction box location so you will have to check the manufacter specs on location due it will varies a bit so be on safe side check it out. Merci,
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Yesterday, 09:11 PM
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Newbie ?Join Date: Feb 2012 Posts: 2 |
It figures. just had a brief look at the definition of continuous load. vague description but thanks anyway. |
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Yesterday, 11:43 PM
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Member ?Join Date: Nov 2007 Location: Nashua, NH, USA Posts: 4,955 |
Note that ovens cycle on and off to maintain the desired temperature. It is highly unlikely that both ovens would have cycled on and remained on together for a period of more than 3 hours, which is the defnintion of a continuous (as opposed to intermittent) load.
__________________ Last edited by AllanJ; Yesterday at 11:46 PM. |
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Yesterday, 11:50 PM
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Member ?Join Date: Oct 2009 Posts: 77 |
Not to hijack his thread, but if you know an appliance will run continuously like an air conditioner in south Texas, should it be considered a continuous load? My two 7.5 ton units run 18 hours per day in our 110 degree heat. They never cycle until we close the door and turn off the lights. David |
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Today, 12:24 AM
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" Euro " electrician ?Join Date: Apr 2006 Location: WI & France { in France for now } Posts: 3,706 |
Quote:
I can understand the nature of southern Texas with heat wave it is simauir to our most southen France on tempture wise it is not too far off from there. But did the HVAC contractor did look at the unit to make sure it is sized properly if sized properly it will cycle from time to time if it was undersized may have to upgrade to twin 10 tonnes units but there is a clevation with it is you will have to check the supply to see if they can handle addtional load for the A/C units. But I can understand some unit that can run almost contionuns they will design the circuit properly to handle that. The last 7.5 tonne unit I have see one Trane unit it did have dual compressours so it will adjust the compressour as need to for addtional load to keep it up on hevey demand. Merci,
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Today, 09:17 AM
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Member ?Join Date: Nov 2007 Location: Nashua, NH, USA Posts: 4,955 |
The 8 gauge copper wire will be fine for the 80' (160' round trip) run in terms of wire resistance (.64 ohms per 1000'). The voltage drop at maximum draw (34 amps) will be about 3-1/2 volts or about 1-1/2 percent of 240 volts. When sizing the conductors for voltage drop purposes you do not multiply amperes by 1.25 for continuous loads. Then given the conductor size for amperage and, if applicable, continuous load and the conductor size for voltage drop, you choose the larger of the two. Air conditioners are considered continuous loads. The installation instructions should give a recommended breaker rating. Sometimes there is a maximum allowable breaker rating as well.
__________________ Last edited by AllanJ; Today at 09:28 AM. |
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Today, 12:52 PM
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retired elect/hvac/plumb ?Join Date: Jan 2010 Location: south east of omaha Posts: 1,765 |
Quote:
 And the 6/3 wg does cost that much more for peace of mind |
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Today, 01:24 PM
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Retired Elec. Engineer ?Join Date: Feb 2012 Location: Mid Missouri Posts: 2 |
+1 on this post! During my 36 years working for a large electrical utility, I've seen a number of disasters from customer wiring without proper knowledge. If your calculations are in doubt or borderline I always recommend installing the next larger wire size. When cooking a holiday dinner many ranges are operated at or near maximum amperage for many hours which can generate a lot heat in the conductors & connections. Last edited by MoHawk; Today at 01:41 PM. Reason: content |
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Source: http://www.diychatroom.com/f18/proper-calculation-circuit-size-133640/
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