I told you I googled it. Try googling amoacity of 22 awg
Aside from the fact that the code does not allow using 22 AWG conductors for the wiring of the power supply, I am still stuck on the 7 amps.
I did Google it. Yes, one of the websites that I found did list 22 AWG conductors as having an ampacity of 7 amps. However, directly from one of the websites (
www.powerstream.com):
As you might guess, the rated ampacities are just a rule of thumb. In careful engineering the voltage drop, insulation temperature limit, thickness, thermal conductivity, and air convection and temperature should all be taken into account. The Maximum Amps for Power Transmission uses the 700 circular mils per amp rule, which is very very conservative. The Maximum Amps for Chassis Wiring is also a conservative rating, but is meant for wiring in air, and not in a bundle. For short lengths of wire, such as is used in battery packs you should trade off the resistance and load with size, weight, and flexibility. NOTE: For installations that need to conform to the National Electrical Code, you must use their guidelines. Contact your local electrician to find out what is legal!
I was not aware that the rules that electricians live by were titled "Google Electrical Code". There is no reference to 22 AWG wire in the NEC. There is a reference to 22 AWG wire in the NFPA 79, which I suggested in the first place, which you also obviously did not check. In the NFPA 79, in table 12.5.1, the ampacity of 22 AWG wire is listed as 3 amps.
I also asked you if you were using 18 or 22 AWG wire, becuase you initially said 22, but then you changed to 18. You did not answer. If it is 18 AWG, then 7 amps would be correct. Again, are you using 18 or 22 gauge wire?