I am hooking up a hot tub rated for a 50 amps max fuse size. I already have the #8 thhn and 1/2 liquid tight flex conduit. Will the #8 wire be enough for 50 amps.

Yes, #8 copper THHN is good for 50 amps.

I question the 1/2" flex.

Most tubs that I know of need 4 wires, in this case 3-# 8 THHN and 1 - #10 THHN for the equipment ground.

If the whip is short you may not have any problems fitting the wiring in the flex.

Quote:

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Originally Posted by tkrussell

Yes, #8 copper THHN is good for 50 amps.

I question the 1/2" flex.

Most tubs that I know of need 4 wires, in this case 3-# 8 THHN and 1 - #10 THHN for the equipment ground.

If the whip is short you may not have any problems fitting the wiring in the flex.

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Thank you. I am running a sub-panel with 3 wire and running a 4-wire from the sub to the tub.

Subpanel needs a 4 wire also, otherwise what is is the 4 wire branch circuits, so your plan is flawed.