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Old 11-04-2012, 01:18 AM   #1
RyanW
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Apr 2009
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I ran into a small hitch in my RIMS plan. My brewing area is only on a 15A circuit. I pulled an outlet and it is 14gauge wire, not 12 so I guess I'm stuck with 15A.

I assume it's ok to use a higher rated element at lower voltage. I'm thinking about using this element http://bostonheatingsupply.com/SP10869ML.aspx

it's a 240V 4500W element. based on my calculations it should be 1125W at 120V and only pull ~9.5A.

Any forseeable problems with this?

 
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Old 11-06-2012, 01:25 AM   #2
Junkster
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Nope...

 
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Old 11-06-2012, 02:35 AM   #3
Bobby_M
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Why not just use a 1500 watt element? 1500/120= 12.5 amps.
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Old 11-06-2012, 04:41 AM   #4
annoyingrob
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Maybe he wants to be able to utilize the higher output in the future when he has 240v available, and doesn't want to buy two different elements?

Or maybe he's being ambitious and wiring it up to 240v/120v so he has two settings......

 
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Old 11-09-2012, 02:07 AM   #5
RyanW
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Quote:
Why not just use a 1500 watt element? 1500/120= 12.5 amps.
Well I'm trying to stay under 80% of the circuit breaker rating. 80% of 15 is 12. Using the 1500W element wouldn't leave room for a pump.

 
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Old 11-09-2012, 02:11 AM   #6
Bobby_M
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You'd run a 1800 watt hair dryer on a 15amp circuit right?
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Old 11-09-2012, 02:34 AM   #7
RyanW
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My bathroom circuits are all 20A. The kitchen are also 20A so my toaster and coffee maker are safe.

 
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Old 11-11-2012, 05:29 AM   #8
thargrav
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Quote:
Originally Posted by RyanW View Post
Well I'm trying to stay under 80% of the circuit breaker rating. 80% of 15 is 12. Using the 1500W element wouldn't leave room for a pump.
Why do so many assume you can't run a breaker at more than 80% of it's rating? A 15 Amp breaker is rated at 15 Amps, not 80% of 15 Amps and there is nothing wrong with loading it to 15 Amps.

A 1500 Watt element draws 12.5 Amps leaving plenty of capacity for your pump. You can even run a 1650 Watt element (13.75 Amps) and have plenty left over for your pump.

 
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Old 11-11-2012, 05:35 AM   #9
whoaru99
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Quote:
Originally Posted by Bobby_M View Post
You'd run a 1800 watt hair dryer on a 15amp circuit right?
Yes, you would for like 5 minutes, if you had lots of hair.
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Old 11-11-2012, 05:41 AM   #10
whoaru99
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Quote:
Originally Posted by thargrav View Post
Why do so many assume you can't run a breaker at more than 80% of it's rating? A 15 Amp breaker is rated at 15 Amps, not 80% of 15 Amps and there is nothing wrong with loading it to 15 Amps.

A 1500 Watt element draws 12.5 Amps leaving plenty of capacity for your pump. You can even run a 1650 Watt element (13.75 Amps) and have plenty left over for your pump.

Seems I recall seeing that the 80% thing is for continuous loads, 3 hours or more.

But, yes, without regards to any code that may or may not apply, breakers are typically capable of holding 100% load indefinitely and some overload depending on amount and duration.
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