Are you using the correct magnetic safety switch ? Wiring goes thru the safety switch , then pressure switch to motor . Make sure you"re using the correct amperage wiring & breaker also . Its been several years since I"ve done any compressor installations , so I"ve forgotten a lot . You also need to take into consideration how far the compressor is from your main source of power due to voltage drop . Remember 8 ga wire is good for up to 40 amps & 6 ga is for 50 amps . I generally used 6 ga wire from breaker to compressor magnetic safety switch & then 10 ga from there thru pressure switch to motor . I"ve never had any of my installations fail to this day (PTL). I used to be a registered installer for a couple compressor companies . So if the purchaser wanted their compressor warranted by the manufacturer , it had to be installed by me . But of course we did have a couple purchasers try collecting on a warranty issue but lost out when they couldn"t produce my installation paper work . That also saved my butt & reputation back then . I have drawings somewhere of how I used to wire up large compressors if interested & I can locate them . But it"s been 20+ yrs so I can"t guarantee my locating them . Let me know if this helped you any . You might check with your local industrial electrical supplier for help & maybe a drawing of wiring . Just be safe . Make all connections tight & secure . Remember you will have vibrations to contend with . God bless , Ken
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