Do I really need to buy a new disposer power cable?

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  #1  
Old 11-09-10, 05:57 PM
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Do I really need to buy a new disposer power cable?

I'm installing a garbage disposer in my sink. I have an outlet under the sink that is a 15A dedicated outlet.

All the disposer power cables I see are 16 Gauge stranded wire. I have an 18 Gauge wire with a plug already attached. (I cut it off of standard power strip when one of the power strip outlets started to wear out.) The disposer is 9.5 Amp and has 18 Gauge wire inside of it. The power cord I was hoping to use off of the power strip is about 2 feel long.

Do I really need to go back to the store and purchase a dedicated 16 Gauge power cable, or will my 18 Gauge one be OK?

For those curious, this wire is:
18-3 SJT (UL) E3462-C CSA LL7874-C FT2 PY
 
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Old 11-09-10, 06:12 PM
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You must use a 16ga or larger cord. 18ga is rated for 10A, but you must derate by 20% so it is only suitable for an 8A device. 16ga has a 13A rating, so when derated is suitable for 10.4A. If you look at those power strips, they usually are rated for 7 or 8 amps and have a matching circuit breaker. Now you know why.
 
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Old 11-09-10, 06:16 PM
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You no longer have the UL listing from the cable once you cut it off. What does the manufacturer instructions state?
 
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Old 11-09-10, 06:41 PM
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The disposer is 9.5 Amp and has 18 Gauge wire inside of it
Wire in the garbage disposal has insulation different from house wiring. The temperature rating is often higher. Conductor size is only one factor that determines wires amp capacity.
 
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Old 11-09-10, 07:30 PM
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The cordset must be listed for use with the disposal. Using the end of an extension cord is not appropriate.
 
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Old 11-10-10, 07:01 AM
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Then I shall get a new power cord.
 
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Old 11-10-10, 03:07 PM
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Originally Posted by JerseyMatt View Post
You must use a 16ga or larger cord. 18ga is rated for 10A, but you must derate by 20% so it is only suitable for an 8A device. 16ga has a 13A rating, so when derated is suitable for 10.4A. If you look at those power strips, they usually are rated for 7 or 8 amps and have a matching circuit breaker. Now you know why.

Matt; curious; Who is calling for the 20% derating?
 
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