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Can thhn wire be run exposed in a plenum rated ceiling for grounding?
yes
How many 12 thhn conductors are allowed in half inch conduit?
9
Difference between romex and thhn wire?
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.
Can you run 8 gauge thhn wire for 30a circuit?
yes
What is amperage rating of thhn 450 MCM copper wire?
410 Amps @ 90°c with 3 or less conductors in the conduct.
How many number 12 THHN conductors are allowed in half inch EMT?
According to the 2005 NEC Annex C, table C.1 you are allowed nine #12 THHN conductors in a 1/2" trade size EMT conduit. If your conduit run is any length at all, you would be wise to increase the conduit size to 3/4". as pulling 9 #12's for any length in 1/2" EMT is very difficult.
Can you install more than 8 conductors of 480 volt in a 2conduit?
That depends on the size of the conductor and the type, which is defined by its insulation. With many common large feeder conductors such as THHW, the largest conductor which you can run 8 of is # 2 gauge. Whereas common small branch circuit conductors such as # 12 THHN, you can run 138 ea. through a 2 " conduit. For the complete list, look at the chart titled "Maximum number of conductors in electrical metallic tubing" (EMT) in the National Electrical Code.
What is the difference between thhn and romex?
THHN Is used in conduit, Romex is not.
Five 8 aluminum conductors with THHN insulation are to be routed through a conduit found in a boiler room with an ambient temperature of 75 degree C. What would be the ampacity of each conductor?
#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.
What size wire do you need to run 220V 60 amp service about 100 ft to your pool heater?
#6 thhn
What size PVC conduit would be required to carry five runs of number 12 AWG conductors?
It's 12 AWG THHN, 1/2" PVC would be just fine
What should people do in case of a tsunami?
# Do not run towards the newly exposed ocean floor # Do not run towards the newly exposed ocean floor # Do not run towards the newly exposed ocean floor # Do not run towards the newly exposed ocean floor # Head for high ground immediately # Do not try and collect small valubles prior to heading out. The ocean will take care of any thieves, or it will take care of people who hang around collecting their bits. # Do not run towards the newly exposed ocean floor # Do not run towards the newly exposed ocean floor # Do not run towards the newly exposed ocean floor # Do not run towards the newly exposed ocean floor # If there is a traffic jam, run to the highest building and wait.
