Relay Question

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