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Under-sink Wiring Help (Disposal) Made Stupid Mistake; Now Concerned on Safety

Under-sink Wiring Help (Disposal) Made Stupid Mistake; Now Concerned on Safety

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  #1  
Old 12-27-16, 10:34 PM
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Under-sink Wiring Help (Disposal) Made Stupid Mistake; Now Concerned on Safety

Goal:
Wire Garbage Disposal (Unit = https://goo.gl/Ucwzq).

SEE STEP 4 OF THE MANUAL FOR WIRING INSTRUCTIONS

Current Status:
Completed and wired but I'm nervous.

I'm kicking myself because I went too fast and I failed to follow instructions. I cut the head off the power cord, which the manual specifically says not to do.

Power Source:
Romex directly from 20-Amp Breaker (a pro put the wiring in place for a dishwasher and I'm trying to tap in)

MS Paint Diagram:
Pic

Photo:
Pic

Questions:
  1. Despite warnings in manual, am I ok to cut off power cord's head?
  2. If yes to #1, am I ok to assume ribbed black = white
  3. Am I ok to join the dishwasher and disposal together within a single wiring nut like this? Will there be too much current (especially concerned whether the current from the dishwasher will overheat the flimsy garbage disposal "power cord")?
  4. Am I properly grounded even without using "BX" cable? The manual seems to imply non-BX cable means I need to ground to a pipe?
  5. In general, is this setup 100% safe? I'd much rather be safe than sorry.
  6. Given my mistake (see #1), how can I salvage this?

-----------

ALSO NOTE:
  • The switch is a 15-amp switch, I'm going to upgrade to a 20-amp switch to match the breaker.
  • For lack of a better term, I plan to jam all of the wiring nuts into a plastic gang box like this: https://goo.gl/T6HOxK
 
  #2  
Old 12-27-16, 10:49 PM
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Replace the power cord.

If there is not a duplex receptacle for the dishwater under the sink install a receptacle in an old work box (not a new work box you show).

Wire the receptacle as shown in your diagram.

If there is a duplex receptacle under the sink for the dishwasher make one half switched and plug the garbage disposal into that.

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Old work box

I'm going to upgrade to a 20-amp switch to match the breaker.
No need. 15a is okay.
The manual seems to imply non-BX cable means I need to ground to a pipe?
A water pipe is not a code compliant solution for a ground. Modern BX cable contains a bonding strip and is an acceptable ground.

If I was wiring this from scratch I would use a cord set on both the dishwasher and the garbage disposer and place a split duplex receptacle under the sink.

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Last edited by ray2047; 12-27-16 at 11:59 PM.
  #3  
Old 12-28-16, 05:51 AM
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Ray, incredibly helpful. Looks like I'll be making another trip to THD.

thanks for your help.
 
  #4  
Old 12-28-16, 08:10 AM
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By the way, I'm now thinking something like this:

PIC

If you have the time, I'd very much appreciate if you could review my updated diagram.
Thanks again.
 
  #5  
Old 12-28-16, 08:20 AM
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No 3-way switch. The dishwasher is not being switched, it's constant hot (the black wire in Ray's diagram).
Ray's wiring is easy and effective. It's the way it's done.

Be sure to buy power cords with straight plugs, you can't fit two right angle plugs into the receptacle.
 
  #6  
Old 12-28-16, 08:28 AM
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Depending on the code cycle for your area gfi protection may be required.
 
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Old 12-28-16, 08:42 AM
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Is it possible to have a half hot GFCI outlet?

I only wanted one of the outlets to be switched
 
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Old 12-28-16, 08:43 AM
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A gfi receptacle cannot be half switched.
 
  #9  
Old 12-28-16, 08:46 AM
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Okay. Then I think I will leave the dishwasher hardwired and use it GFCI for the garbage disposal power cord. Thank you
 
  #10  
Old 12-28-16, 08:50 AM
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You can install a 2 gang box with a gfi and a receptacle.

There is no need for tape on the wire nuts either.
 
  #11  
Old 12-28-16, 09:50 AM
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Or use a two gang box for the switch and use a dead face GFCI or use a GFCI breaker.

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Last edited by ray2047; 12-28-16 at 10:30 AM.
  #12  
Old 12-28-16, 05:40 PM
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finished up this afternoon. dishwasher is hard wired. GD is switched and plugged into a GFCI outlet.

thanks to everyone for helping.
 
 

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