How do you change wire size in Revit?

How does Revit calculate wire size?

Revit calculates the wire sizes for power circuits based on the size specified for circuit protection, voltage drop calculation, and correction factor.

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1. Length (L) = 100 ft.
2. Impedance (Z) = 1.326 from Wire Impedance table for #8 in steel conduit at 80 degrees.
3. Load (I) = 50A.

What is the maximum percentage voltage drop that Revit allows for feeder circuit wire sizing based on the current rating of the circuit?

Wire sizes are automatically sized to maintain a voltage drop of less than 3 percent for branch circuits, and 2 percent for feeder circuits at the outlet furthest from the source.

How does Revit calculate voltage drop?

Voltage Drop Calculation



VD = Voltage Drop. L = One-way length of circuit in feet. R = Conductor resistance in Ohms per thousand feet, from the wire size impedance tables for the specified wire type.

How do you size a circuit breaker branch?

When sizing branch-circuit conductors, the minimum branch-circuit conductor size shall have an allowable ampacity not less than 125 percent of the continuous load [210.19(A)(1)]. When sizing overcurrent protection, the overcurrent device rating shall not be less than 125 percent of the continuous load [210.20(A)].

How much voltage drop is allowed?

How much voltage drop is acceptable? A footnote (NEC 210-19 FPN No. 4) in the National Electrical Code states that a voltage drop of 5% at the furthest receptacle in a branch wiring circuit is acceptable for normal efficiency.

What is voltage drop formula?

Voltage drop of the circuit conductors can be determined by multiplying the current of the circuit by the total resistance of the circuit conductors: VD = I x R.

Is Revit used for electrical engineering?

Revit Building Information Modelling software helps engineers, designers and contractors across the mechanical, electrical and plumbing (MEP) disciplines model to a high level of detail and co-ordinate with building project contributors.