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Old 2016-04-20, 12:32   #11
Dec 2014

3·5·17 Posts

Originally Posted by Fred View Post
Those use 18 gauge wire which I would recommend limiting to under 10 A current.
(Wikipedia says 14 A heats AWG 18 wire to 90 C.)
300 W at 12 V is 25 A so the PSU wire needs AWG 12 or 14.
And it would be having 12.5 A on the first Y cable.
The above is the worst case. The load is probably spread over multiple wires.

If none of the wires feel hot to the touch, it should be safe.
A "loop" current meter will let you check each wire.
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