is number 8 thhn good for 50 amps 8 THWN has an allowable ampacity of 50 So 8 THHN would be acceptable for a 50A circuit assuming no adjustments or corrections needed
Is it safe to have 50 amps running through 8 copper Click to expand Yes but the infinite wisdom of the NEC says the 8 in romex is special and is only capable of carrying 40 amps Looking at the 310 16 table you see that 8 ampacity is 50 amps at 75C and 55 amps at 90C Under the conditions listed at the top of the table a continuous of 55 amps will heat the conductor to 90C in 3 hrs and 50 amps will heat it to 75C in 3 hrs
is number 8 thhn good for 50 amps
is number 8 thhn good for 50 amps
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They used 8 THHN on 50 amp breakers for some 14 50 twist lock receptacles The breaker terminal rating says CU AL 60 75 Am I reading this correctly that it is rated 60 degrees for copper and 75 for aluminum The load s sly choice of 47A for its peak suggests the builder knows it is one Regardless it does not matter to wiring since 6Cu 4Al wire good for 50A is also good for 60A Using two blacks for two hots is fine
For example the load on an 8 AWG THHN 90 C copper wire is limited to 40 amperes where connected to a disconnect switch with terminals rated at 60 C This same 8 AWG THHN 90 C wire is limited to 50 amperes where connected to a For THHN THWN conductors in conduit 8cu is typical on a 50A breaker I guess this is the exception you were referring to although it is not an exception It is more the rule as far as conduit work goes THHN uses the 75 deg C column in figuring ampacity in newer work 8 is rated right at 50 amps in that column
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According to the NEC 8 THHN is rated for 55 Amps before derating factors I figure applying 70 to that amount equals 38 5 Amps Which should be sufficient for the connected loads As long as your installed temperature stays below 100F and your local AHJ agrees that the temperature will remain below that 8 THHN is fine for 50 amps This is also assuming you ve calculated for voltage drop as well which is usually not an issue for runs less than 150 feet
AWG 8 8 gauge THWN 2 OR THHN can be used for both wet and dry applications 90 C THHN 2 THWN 2 is a single wire and counts as 90 C rated which means you can run 55 amps through it The catch is that being wire I d like to verify my NEC understanding on 50 amp circuits specifically it s ok to run 2 hots and a ground 8 awg in 1 2 ENT gray flexible brand of choice for a 50 amp 6 50r receptacle using a 4x2 30 3 cu in metal box
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is number 8 thhn good for 50 amps - The outlet is 50 amp but the wire is 8 Is this safe Depends on the wire You didn t specify what kind of wire you have If it s THHN 2 90C rated in conduit you re fine If it s NM cable by NEC definition 60C it s not If you re not sure which it is assume it s NM which it probably is Should I use 40 amps instead