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# Electric Motors/Wiring a 220 reversable motor.

Question
I bought a new electric 220 motor for my metal lathe to convert it to single phase. My question is I know how to wire up the barel switch but not sure about the motor. On the wiring diagram on it it has line 1 and line 2, both hooked to separate wires, then it has 3 wires hooked to it says insulate, 3 more hooked to another insulate, and one separate one hooked to insulate. On the 2 groups of three you switch one wire on each to reverse rotation. So my question is, if line is power what does insulate mean? If it's ground how would switching the 2 wires from one set of ground to another reverse the rotation. Hope you can help guide me in the right direction. Thanks

Scott it is bad terminology          you are not alone,   good Questions

Here is what it means, when looking at an Electric motor connection,       if they say   connect  1, 4 and 8 and insulate    it should say  connect electrically  1, 4 and 8 insulate and ISOLATE    in other words electrically connect all three stripped back ... together in a bundle,   then use a wire nut and tape,  or a lug and tape, or any clamping device and insulate that group of wires and then they just become a dog knot, and then laid aside in the box,  or get stuffed in the connection box,

Next it says most likely to reverse 5 with 8 for rotation,       unwire  1.4 and 8    swap   8 with 5     where ever 5 is

Take 8 out of the bundle,   put 5 in the bundle with 1. 4  and reconnect electrically and insulate and isolate from everything else,      some times it is just bundles of wires,   sometimes they do it on studs on the terminal board, then put 8 where 5 was in the same exact manner   if 5 was with 2 and 3 put 8 with them  and do the same thing  electrically connect,  insulate  and isolate,        5 and 8 are normally and NEMA assigned ends of the start circuit,    but it could be any numbers  just follow the connection diagram    for that

But anything that says wires  x and y and z  connect and insulate   means just that....... connect electrically,  insulate with half laps of black tape or you could use mica tape  but this is probably only going to be 220 at the highest,   so just GOOD black tape and make sure if you use lugs no sharp edges can pierce the insulation,       it is just a shunted connection    no more no less,

Again they should say  electrically connect,  these wires [whatever they are]  be it two three  four five of them........  then after you get them all touching and connected      then insulate them for 220VAC AND ISOLATE from anything else  especially GROUND

Insulate a group of wires,  =   electrical connection,   insulation,    and then keep them away from anything else including ground

If you need more detail use my personal email it is a bit faster  wbwill@sbcglobal.net

Electric Motors

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#### Will

##### Expertise

Three phase/ AC DC single phase motors, controls, any problems or failures, motor installation, performance issues, connections. All other electric motors/gearboxes/apparatus. Specialty repair concerns, obsolete motors and solutions. Other mechanical or specialty equipment. See my profile under Home/electrical at this site

##### Experience

30 plus years in the electrical motor and apparatus repair industry. VP level management of repair facilities, current owner of my own specialty repair and consulting firm.

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EASA, IBEW [retired], other specialty organizations, Lubrication, Vibration EDI, Tribo-electric Councils

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Currently fielding concerns at this site under "Home Electrical"

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4 year technical, College level specific courses, EASA repair courses, vibration analysis electronic and electrical trade school.