Most common 240 plug in your shop? - Page 2
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  1. #26
    Join Date
    Dec 2007
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    Los Angeles
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    6,733

    Re: Most common 240 plug in your shop?

    Hey Steve,

    you got a link to code for connectors and HP ratings? I know they exist but I can't seem to find a ratings chart.

    Just curious- not arguing
    Ed Conley
    http://www.screamingbroccoli.com/
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  2. #27
    Join Date
    Jun 2015
    Location
    The wheat fields of Kansas,in a large metal building
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    224

    Re: Most common 240 plug in your shop?

    Steve from SoCal now in Hutch

    Miller Dynasty 300DX Coolmate3 Speedway Torch
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    Miller Bobcat 225 NT
    Hypertherm Powermax 45
    And a whole bunch of machines

  3. #28
    Join Date
    Dec 2007
    Location
    Los Angeles
    Posts
    6,733

    Re: Most common 240 plug in your shop?

    Thanks.
    Ed Conley
    http://www.screamingbroccoli.com/
    MM252
    MM211 (Sold)
    Passport Plus & Spool gun
    Lincoln SP135 Plus- (Gone to a good home)
    Miller 125c Plasma 120v
    SO 2020 bender
    Beer in the fridge

  4. #29
    Join Date
    Jun 2012
    Location
    Laredo, Tx
    Posts
    3,137

    Re: Most common 240 plug in your shop?

    Very interesting.




    So far, the plug shows no signs of charring, nor do the spade terminals at the pressure switch. Running 6awg for all three wires to the receptacle, then 8awg 4' run to the pressure switch.
    First person on WeldingWeb to have a scrolling signature!

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  5. #30
    Join Date
    Jun 2015
    Location
    The wheat fields of Kansas,in a large metal building
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    224

    Re: Most common 240 plug in your shop?

    Oscar,

    As I said; you MAY not have any problems with the plug but, it is not rated for 5HP motor loads. The limitation is based on locked rotor current. In that condition the shell could melt before the breaker trips. If you are always there when the compressor runs and you can de-energise the line instead of trying to unplug the cord when a fault occurs you should be OK
    Steve from SoCal now in Hutch

    Miller Dynasty 300DX Coolmate3 Speedway Torch
    Miller XMT 450 MPa plus with D-74 MPa Plus
    Miller Bobcat 225 NT
    Hypertherm Powermax 45
    And a whole bunch of machines

  6. #31
    Join Date
    Jan 2015
    Location
    Hamilton Ontario Canada
    Posts
    225

    Re: Most common 240 plug in your shop?

    I have two 6-20R and one 6-50R in my shop!
    Welders: IdealArc AC/DC 250
    Lincoln AC 225
    O/A torches
    Lots of Hammers and Clamps!

  7. #32
    Join Date
    Sep 2013
    Location
    west texas
    Posts
    2,061

    Re: Most common 240 plug in your shop?

    I don't know why a 6-50 wouldn't be used on a 5hp compressor.
    Lets say you had a "5hp compressor" 0.70 power factor, even way over taxing a 5hp motor say pushing it to 10hp at shut off that would only draw around 40 to 45 amps.
    If you are worried about the motor seizing up and burning down the place, get an amp reading from the compressor while its running and add a slow blow fuse to each line rated for 120% of normal amps you get right before shut off.
    Or put the 5hp compressor on a smaller breaker, 30 or 40 amps. A 30 amp breaker would work if the inrush current doesn't trip it, but I have a feeling it would.
    I put nema10-30 clothes dryer cords on my 2.5hp and a 3hp compressors and the cord barely gets warm when I am sand blasting running them for all their worth.
    We have welding machines that have 6-50 plugs that draw well over 50 amps. My stick welder draws over 50 amps at full power. Before power factor correction it would trip a 50 amp breaker at full power. The manual said to put it on a 70 amp breaker. Now with power factor correction its never tripped the 60 amp breaker its on. (70 amp square D QO are double the price of 60 amp QO breakers)

    So a proper 6-50 cord will take it.
    The only way a 6-50 cord wouldn't work is if say you cut one off the new Lincoln AC235, its only got a 12ga wired plug and wired it into a big compressor.
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