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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 single-conductor wire typically used in conduit for indoor wiring, while Romex is a brand of non-metallic sheathed cable that contains multiple insulated conductors in a flexible plastic jacket. THHN must be used inside conduit, while Romex can be run along surfaces or in walls without conduit.
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.
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?
The ampacity of each 8 AWG THHN conductor in a conduit in a boiler room with an ambient temperature of 75°C would be approximately 40 amps. This value is based on the 75°C temperature rating for THHN conductors as per the NEC guidelines.
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 thwn conductors exposed?
Exposed THWN (Thermoplastic High Heat-resistant Nylon-coated) conductors are not suitable for use as they are not rated for exposure to the environment. This can lead to safety hazards such as electrical shocks or fires. It is essential to follow proper installation practices to ensure the safety and longevity of electrical systems.
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 size PVC conduit would be required to carry five runs of number 12 AWG conductors?
For five runs of #12 AWG conductors, a minimum of 1 inch PVC conduit would be required to meet the fill ratio requirements, providing adequate space for the conductors while allowing for future additions or modifications.
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.
Is Romex in conduit allowed?
No, Romex cable is not allowed to be run inside conduit. Romex cable is intended to be used in exposed or concealed applications within buildings. If conduit is used, it should contain individual THHN/THWN wires instead of Romex cable.
