Plug configuration

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  #1  
Old 08-20-06, 12:36 AM
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Plug configuration

What is a Twist lock plug and how does it work? Can anyone show a configuration of a 230-V Twist lock plug?

Thank you

Rickie
 
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  #2  
Old 08-20-06, 12:50 AM
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A twist lock plug is inserted into a connector or receptacle and you turn it approximate 1/16 of a turn to lock it in place. These were designed to prevent accidental disconnection of power.

Configurations vary depending upon voltage, number of poles, number of wires and amperage.

Hubbell is a common manufacturer of these plugs, receptacles and connectors. You can see some of their common configurations at the link below.
http://www.hubbell-wiring.com/library/pressreleases/h4572.pdf#search=%22twist%20lock%20plugs%22

or

http://www.hubbell-wiring.com/LockingDevices.asp
 

Last edited by gilchrist-elect; 08-20-06 at 01:30 AM.
  #3  
Old 08-20-06, 06:07 AM
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Another reason they are used is to prevent other loads from being use in a common area.
The pool motor requirement is a prime example. They do not want you plugging in a power tool with an 8' cord into a receptacle that is 5' from the pool water.
 
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Old 08-20-06, 06:56 AM
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"Can anyone show a configuration of a 230-V Twist lock plug?"

Not only is the configuration dependant upon the voltage rating but by amperage rating and number of phases (single phase or 3 phase) and the total number of wires used.


If you can fill in the blanks for the info above somebody can point you to the exact recep you are asking about, if you haven't already found it.
 
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Old 08-20-06, 09:09 AM
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yeah, thanks guys. This is the recomendation for an air compressor. It's 230-V and the literature that comes with it says it's 7amp.
 
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Old 08-20-06, 09:42 AM
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Ok, now that we have that info, does the compressor come with a plug on it. It may have the NEMA designation on it or the literature may list the required receptacle in NEMA terms.

Something like "L6-15R" or "L6-20R" is what I would expect to see listed as a required receptacle.

nomenclature designation as follows:

L-locking
6- 250 volt rated single phase 3 wire grounding type
15 or 20- amperage rating
R- receptacle (a "P" would be the male plug and "C" would be a female connector on the end of a cord)


L6-15P: http://www.twacomm.com/catalog/model_4570.htm
L-6-20P: http://www.zirion.co.jp/support/eleups/concent/img/L6-20P.gif
 
  #7  
Old 08-20-06, 10:02 AM
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No plug on the compressor. It is Single-phase. I looked at the page http://assets.twacomm.com/assets/pdf/23665.pdf
and it appears that the plug (4570-CA) plugs into the female connector (4579-C), which is attached to the compressor cord. Is this correct? And thanks for all the help.

Rickie
 
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Old 08-20-06, 10:39 AM
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actually you would want what they designate as 4560 which is a receptacle. The 4579-c is for the end of a cord.

These numbers are Leviton part numbers. What you really need to be concerned with are the NEMA designations which are the L6-15R and L6-15P. They are a (generally) universal designation for the actual configration. Any manufacturer will be able to get you a part using these designations but each have their own part numbers used only by them.

Now mind you, this (the 15 amp rating devices) is to be used on only a 15 amp circuit. Without checking to be positive, I believe a 20 amp circuit would also be acceptable with your compressor. I would suggest this as the starting current of your compressor will be considerably higher than the 7 amp FLA listed on the motor. (L6-20R and L6-20P)

wire sizes for the cirtuits are to be no smaller than 14 awg for the 15 amp circuit and 12 awg for the 20 amp circuit.

btw: NEMA- "national electrical manufacturers association". It is a body, that among other things, sets standards for things like receptacle configurations for the electrical manufacturers of the U.S.
 
  #9  
Old 08-20-06, 10:48 AM
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Thanks Nap. I think I got it. It will be on a 20amp circuit with 12-2/g.
 
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