Why are you all giving the TS so many different answers? Facts are far better answers than opinions.
In post#1 he mentions a foot of 24AWG wire and a DC 3Asupply. In post #5 he mentioned that the load current is 1.5A max.
24AWG wire has a resistance of 25.67Ohms/1000ft. Therefore 1.5A will cause a voltage drop of 38.5mV over 1ft. of wire. That will be 58mW of power. That's definitely not enough to cause a dangerous temperature in the wire!
Of course it is VERY SAFE to use 24AWG wire in this case!

But if there is a current overload on PCB, you don’t want the wiring to fail, you want the fuse to blow or breaker to disconnect.

 

But if there is a current overload on PCB, you don’t want the wiring to fail, you want the fuse to blow or breaker to disconnect.

It's a 3A supply. so that is what the current will be limited to if there is a short on the load. That is still not enough current to even warm up a foot of 24AWG wire.

 

The power supply is from AC to 24vdc, max supply is 3 amps but the pcba is only 1.5 amp max.This wire will only go to the power supply toggle switch to the pcba.Pcba is just led lighting with a driver and passives

Does the power supply have current limiting built in?

 

Hey, @SamR—is that a spreadsheet? Is it available as one?

Google search image for chassis wiring amperage 9f3el.png (1340×855) (imgur.com)
Difference between maximum amps for chassis wiring and power transmission - Electrical Engineering Stack Exchange

Chassis wiring amps are much greater than power/control runs in cable or conduit which is mostly what I designed for back when.

EDIT: The difference is because chassis wiring uses a single conductor in free air instead of a bundle contained inside a cable or conduit.

 

Does the power supply have current limiting built in?

Does that really matter? The load draws 1.5A. The chassis wiring current limit for 24AWG is 3.5A. If the supply is fused for 2.5A it will blow on a short before anything else gets damaged.