90 degrees Celsius
#8 aluminum thhn 90 degree wire is rated at 30 amps. Remember to de-rate the wire for more that three conductors in a raceway and the second de-rate for the ambient temperature. Most students miss the de-rate for more that three conductors in a raceway.
A 12 ga wire will overheat when you attempt to use it for a 30 amp draw. The National Electrical Code is a well thought-out standard of engineering and the requirements are not arbitrary. If you attempt to use 12 ga for 30 amps, you'll likely cause a fire.
THHN is a heat resistant thermoplastic insulated conductor, usually a single conductor. Romex is a brand name for a nonmetallic sheathed cable, it has multiple conductors inside, the insulated ones are insulated with THHN insulation.
No, THHN is not oil resistant. The Underwriters Laboratories' (UL) "Marking Guide Wire and Cable (January 2010)" shows that THHN is not sunlight, oil, or gasoline resistant; it can not be used in cable trays, direct burial, or for submersible pumps. THHN is a heat-resistant thermoplastic rated for 90 degrees C (140 degrees F), can be used in dry and damp locations. See related links below for the UL Marking Guide.
The temperature has no effect on the wire needed, only on the insulation and installation details. !70 A would require 35mm2 copper in free air. Soil disipates heat better than air, so the cable would take more current and be safe if it was in/on the ground. In any form of conduit, you'd need a bigger cable.
THHN wire is moisture resistant thermoplastic allowed for use in dry and wet locations. Maximum temperature is 60 C or 140 F. Being thermoplastic it should not be handled below 0 C as cracking of the insulation could easily occur.
#8 aluminum thhn 90 degree wire is rated at 30 amps. Remember to de-rate the wire for more that three conductors in a raceway and the second de-rate for the ambient temperature. Most students miss the de-rate for more that three conductors in a raceway.
Its normal power rating is at room temperature. For a temperature of 75 degrees, halve the rating.
n you run thhn wire in a cable tray
I think this refers to the continuous temperature rating, which is the maximum rated winding temperature allowed for a maximum ambient air temperature of 40deg C.
A 12 ga wire will overheat when you attempt to use it for a 30 amp draw. The National Electrical Code is a well thought-out standard of engineering and the requirements are not arbitrary. If you attempt to use 12 ga for 30 amps, you'll likely cause a fire.
The temperature rating for PVC Schedule 80 piping is typically around 140F to 160F.
The temperature rating for SCH 80 PVC pipes is typically around 140F (60C).
The temperature rating for Schedule 80 PVC pipes is typically around 140F (60C).
THHN wire is suitable for use in residential and commercial electrical wiring applications, such as powering outlets, switches, and lighting fixtures.
THHN is a heat resistant thermoplastic insulated conductor, usually a single conductor. Romex is a brand name for a nonmetallic sheathed cable, it has multiple conductors inside, the insulated ones are insulated with THHN insulation.
The electrical tape temperature rating for use in high-temperature environments is typically around 80 to 90 degrees Celsius (176 to 194 degrees Fahrenheit).