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Good evening, my name is ***** ***** will be happy to assist you with your electrical questions. thhn wire is a general purpose conductor rated for 600 Volt not to exceed temps of 90 degrees C
Oh ok, cool. Yes, a blue will be part of a 3 phase system. Red, Black, Blue. A,B,C. Line 1 Line 2 Line 3.
Say for example a 120/208 Volt system. Red,black,blue will all have 208 volts across them line to line, and will have 120 volts hot to neutral.
Most commonly in NA in commercial and industrial applications. Some residential in the UK as well, that is correct.
Not a problem, you are welcome. Have a great evening.