The required size of a conduit raceway for a 3-5000 mcm wire is 300 kcmil. It maximizes the limits on the wire fill for raceways.
Conduit sizing is based on the number of conductors that are drawn into it. Without the number of 1000 MCM conductors, an answer an not be given.
250 MCM aluminum minimum
500 MCM (thousand circular mils) is equivalent to approximately 3/0 AWG (3 aught) in the American Wire Gauge (AWG) system. MCM is often used for larger conductors, particularly in industrial applications, while AWG is more common for smaller wires. The exact conversion may vary slightly depending on the specific context or wire type, but 3/0 AWG is the standard equivalent for 500 MCM.
There are different combination to obtain a current capacity of 1250 amps. A parallel run of #1250 MCM wires. A triple run of #600 MCM wire. The most flexible run would be with a quad run of #350 MCM wire.
This size service can be wired in a few combinations. Two parallel runs of 1250 MCM, three parallel runs of 600 MCM, four parallel runs of 350 MCM. Of the three choices the four runs of 350 MCM wires would be the easiest to handle if there are any bends in the service entrance conduit.
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.
Conduit sizing is based on the number of conductors that are drawn into it. Without the number of 1000 MCM conductors, an answer an not be given.
For three 500 kcmil (MCM) cables, you would typically use a conduit size of at least 4 inches in diameter. This is based on the National Electrical Code (NEC) guidelines, which take into account fill capacity and the need for proper heat dissipation. However, it’s essential to verify with local codes and regulations, as well as consider factors like additional conductors or bends, which may require a larger conduit. Always consult with an electrical engineer or professional for precise calculations and requirements.
250 MCM aluminum minimum
500 mcm
500 MCM (thousand circular mils) is equivalent to approximately 3/0 AWG (3 aught) in the American Wire Gauge (AWG) system. MCM is often used for larger conductors, particularly in industrial applications, while AWG is more common for smaller wires. The exact conversion may vary slightly depending on the specific context or wire type, but 3/0 AWG is the standard equivalent for 500 MCM.
For a 400 Amp service with 500 MCM conductors, the minimum size grounding electrode conductor required would be 3/0 AWG copper or 250 kcmil aluminum based on the NEC Table 250.66.
There are different combination to obtain a current capacity of 1250 amps. A parallel run of #1250 MCM wires. A triple run of #600 MCM wire. The most flexible run would be with a quad run of #350 MCM wire.
A 1250 MCM copper conductor with an insulation factor of 90 degrees C is rated at 645 amps. If you have ever worked with these sized conductors you would know that it is nearly impossible to bend, let alone pull it into a conduit. Seeing how the conductor size is over 1/0, it can be paralleled up to smaller size conductors to meet the ampacity requirement. The options are, parallel 350 MCM, triple parallel #2/0 or quad parallel using #1/0 size wire. These wires are terminated in double, triple and four barrel lugs respectively. It has to be kept in mind that as the amount of wires increase, so does the conduit diameter size, to accommodate the conduit fill code rule.
Answer for USA, Canada and countries running a 60 Hertz supply serviceIf you use 500 MCM wire rated at 90 degrees C which is rated at 515 amps and allow for 80% ampacity of the wire which equals 412 amps, the conduit size will be three inches. If you use 700 MCM wire rated at 60 degrees C which is rated at 500 amps and allow for 80% ampacity of the wire which equals 400 amps, the conduit size will be three and one half inches.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-energizedIF YOU ARE NOT REALLY SURE YOU CAN DO THIS JOBSAFELY AND COMPETENTLYREFER THIS WORK TO QUALIFIED PROFESSIONALS.
This size service can be wired in a few combinations. Two parallel runs of 1250 MCM, three parallel runs of 600 MCM, four parallel runs of 350 MCM. Of the three choices the four runs of 350 MCM wires would be the easiest to handle if there are any bends in the service entrance conduit.
Using the AWG for wire sizes only goes up to 4/0. After that the increases use MCM to size the wire. So your 262 MCM wire size will be same in AWG. There is no 262 MCM in the North American market place. It goes in 50 MCM increments starting at 250 MCM , 300 MCM, 350 MCM, 400 MCM right up to 2000 MCM cable.