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Conductors should not be smaller than #8 copper. With that that in mind a 1" conduit would work. Better to use at least 1 1/2-2" depending on the amps of your service. Bigger is always better!
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As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.
Before you do any work yourself,
on electrical circuits, equipment or appliances,
always use a test meter to ensure the circuit is, in fact, de-energized.
IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.
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What size conduit is needed for a 100 amp service according to the nec?
According to the NEC, a minimum of 1.5-inch conduit is required for a 100 amp service. It is important to follow local codes and regulations which may vary. Consulting with a licensed electrician is recommended for proper installation.
What size rigid conduit for 400 amp service?
For a 400 amp service, you would typically use a minimum of 3-inch rigid metal conduit (RMC) to accommodate the large conductors required for that amperage. It's essential to consult local electrical codes and regulations to ensure compliance with sizing requirements for your specific installation.
What must be attached to the top end of a conduit riser where conduit is used in a service?
A service head or LB fitting must be attached to the top end of a conduit riser where conduit is used in a service. This provides a termination point for the conduit and allows for easy access to the conductors inside the conduit.
What size conduit for 400amps?
The sizing of conduit systems that wire has to be pulled into is dependant on the physical size of the conductor being drawn into the conduit. The second governing factor is the conductor count of the specific conductor that is needed. A 500 MCM copper conductor with an insulation factor of 90 degrees C is rated at 430 amps. This is where the conductor count is need by the service, as to whether the service is single or three phase. In this specific case, the electrical code will allow both single and three phase installations to use the same size conduit. A maximum total of four 500 MCM conductors can be drawn into a 78 mm diameter conduit.
When paralleling a service must the sets of conductors be in separate conduits or can they be in the same conduit?
It is common practice to run paralleled sets of conductors in separate conduits to ensure proper current sharing and to reduce the risk of electromagnetic interference. However, they can be run in the same conduit as long as the conduit is sized appropriately to accommodate all the conductors and complies with local codes and standards.
