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n you run thhn wire in a cable tray
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What is the ampacity of each five no 8 aluminum conductors with thhn insulation being routed through a conduit with ambient temperature of 75 Celsius?
School question. The answer can be found in your electrical code book.
Can a three phase circuit be installed in the same conduit or in different conduits?
The conductors of any three phase circuit must be run in the same conduit. If the circuit requires a neutral, it must also run with the conductors in the same conduit. (If they were to be run in more than one conduit or raceway, the circuit would not operate properly.)
What size conductors are needed to run a 400 foot residential underground electric service?
Need to know what size service is going to be installed at the end of the run.
Does the Nec allow grounding electrode conductor to be run in conduit that has other conductors in the conduit and what code section?
No, the bare copper grounding conductor can not be in a conduit with other conductors. It can be in conduit by itself to provide mechanical protection for the wire.
What does an underground electrical pull box do?
An underground electrical pull box provides another access point in long runs of cable to make it easier to pull the conductors from one end of the run to the other. The crew can only slap so much silicone lube on the conductors and the the conductors can only have a limited amount of force applied on them to pull them through the conduit. If a long run is broken up somewhere in the middle, the crew can pull to that point where the pull box is located, and then "start a new pull" from the box to the end of the run. It's more work, but it protects the conductors and the job ends up "meeting code" and passing inspection.
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
What is the difference between thhn and romex?
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.
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.
Can you run 8 gauge thhn wire for 30a circuit?
yes
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 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 is the ampacity of each five no 8 aluminum conductors with thhn insulation being routed through a conduit with ambient temperature of 75 Celsius?
School question. The answer can be found in your electrical code book.
How many thhn conductors are allowed in half inch emt?
9 - Is this a test answer or do you just want to know for a project you're doing? Take a look at NEC chapter 9 - tables 4 and 5 (in the 2005 edition at least)
What to 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.
What is the purpose of insulation tape?
Insulation tape is used to protect exposed electrical conductors or wires. Another term for it would be electrical tape. It is wrapped around wires and other electrical conductors to protect them.
