[Gooserider]

A few points...

1. US House wiring is typically 14 or 12 guage for normal 110VAC wall sockets, lights, etc. 14 is good for 15A circuits, 12 is needed for 20A. 10g or heavier is usually only found on 220VAC, and other heavy duty circuits.

2. House wiring is not really suitable for use inside a PC. It is solid core wire, very stiff, and not intended to be used in applications where it will be subjected to vibrations or flexing. In a PC you should be using stranded flexible wire. (such as found in a power cord)

3. The pump is very low current draw, and could safely be wired with 18g wire (i.e. lamp cord). In theory it could even be wired safely with thinner wire (22g?) from a current standpoint, however wiring standards say that 18g is the thinnest wire permitted for use w/ 110VAC for reasons of mechanical strength as much as current handling ability.

4. From a failure standpoint, 18g wire will carry enough current to blow the fuse before the wire will get hot enough to cause a fire. The connected device might get hot, but that is not a wiring related issue.

5. The discussion of the wiring left out one important question about the location of the thin wire from the molex plug - Namely where the thin wire is located in the circuit! Remember that there are really two (or more) different circuits in a relay, the coil circuit and the switched circuit. The switched circuit in this case will be 110VAC, probably having a 10A rating on the contacts, and should be wired with at least 18g wire. (Larger wire is OK, but overkill) The coil side is probably going to be 5 or 12 volts DC (from the PSU) and have power through it on the order of milliAmps. Nearly any size wire would be fine from a current standpoint, but at least 18-20g should be used to give enough mechanical strength.

Hope this helps
Gooserider