what gauge wire should i use for a 60 amp hot tub (outdoor placement)?
Answers:
#6 AWG copper is rated for 65 amps or #4 AWG aluminum.
Hot tubs are very tricky. Be sure you use a GFCI breaker. There needs to be a disconnect outside near the hot tub (not less than 5 feet away). There are many other issues regarding lighting fixtures and receptacles near the hot tub. If you are unsure of the requirements, check with your local building inspector. I highly recommend an inspection by either the electrical inspector or a local licensed electrical contractor before using the hot tub.
Water and electricity do not mix. Be sure to turn off the power before working on any circuits and verify that the power is off with a voltmeter.
Other answers:
I would check with an electrician
I would check with an electrician
Outdoor hot tubs follow the same code requirements as pools. This is something that should never be done by someone without training. There is a lot more than the wire size. There are restrictions on the type of wiring methods used (there are cases that conduit would be required indoors). There are bonding requirements (you'll say, "what is bonding?"--that just shows you shouldn't be doing this yourself. Read article 680 of the national electrical code and see if you even have a clue what it is talking about. Unless you totally understand what it says to do, don't do this yourself.
Also, the 65 amp comment by the other answer for 6AWG copper does not apply to Romex. 6AWG copper in romex is only 55 amp.