Relay Question

[1967Valiant]

Hello everyone been awhile since I posted and the Valiant is coming along nice, but not as fast as I would like. I am in middle of building fuse and relay box and have a question. The trip side of relay the ground and Positive that activate the relay the current is way small in amps, right? so I can trip the relay with 22gauge wires in the fuse panel since they draw little to no amps from positive or ground to trip the relay active. Is this correct? Also the only thing that size of wire will be used for is to trip a Relay. I attached a PDF photo for any input you might have.:happy1:





[img=http://img594.imageshack.us/img594/8192/img0045ac.th.jpg]
[img=http://img43.imageshack.us/img43/5785/img0046vj.th.jpg]

 

[RedFish]

I'm not sure how much ampherage is used when a relay is energized. I suppose it would vary with the size of the relays' coil. There are several different sizes of relay out there.

 

[Wrencher]

Chances are 22g will be alright. If I remember correctly the max amperage over a long run is .90a, but on a short run its like 2.8

im guessing your relay has a 75ohm coil and is going to require .2 amps to pull in...

 

[superchargeddrt]

That is correct. The coil side of th relay (the side that has the coil that createsthe magnetic field used to pull the high current contacts together) will draw very little current.

Hello everyone been awhile since I posted and the Valiant is coming along nice, but not as fast as I would like. I am in middle of building fuse and relay box and have a question. The trip side of relay the ground and Positive that activate the relay the current is way small in amps, right? so I can trip the relay with 22gauge wires in the fuse panel since they draw little to no amps from positive or ground to trip the relay active. Is this correct? Also the only thing that size of wire will be used for is to trip a Relay. I attached a PDF photo for any input you might have.:happy1:





[img=http://img594.imageshack.us/img594/8192/img0045ac.th.jpg]
[img=http://img43.imageshack.us/img43/5785/img0046vj.th.jpg]

 

[67Dart273]

Number 22 will work fine electrically to operate the coil, a couple of caveats:

Some relays have built in diodes to protect the switching end from inductive kick on release. (DC only, does not apply to AC relays) This means that they are now polarity sensitive. You can find this out by applying an ohmeter to the coil, and then reversing the meter leads. A different resistance when reversed means there's a diode in the relay

In addition, let's say that your trigger lead SHORTED due to a fault out near the relay. If you are using very small ga. wire, but DON'T have it very lightly fused, the wire may end up "protecting the fuse" rather than the other way around