Lecture-12.-Short-Circuit-Calculation.pdf - Shop Practice with Electrical Code Voltage Drop and Short Circuit Calculation Residential Single Phase

# Lecture-12.-Short-Circuit-Calculation.pdf - Shop Practice...

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Shop Practice with Electrical Code: Voltage Drop and Short Circuit Calculation Residential Single Phase System Jayson Bryan E. Mutuc, REE, RME BSEE-PUP
Voltage Drop 2.10.2.1 (a) (1) FPN No. 4: To provide reasonable efficiency of operation of electrical equipment, branch-circuit conductors should be sized to prevent a voltage drop not to exceed three percent. In addition, the maximum total voltage drop on both feeders and branch circuits should not exceed five percent.
Voltage Drop Calculation Voltage Drop Calculation: %VD = IR Voltage Supply (V 3 ) x100% where: I – line current, amperes R – line ac resistance, ohms
Purpose of Short Circuit Calculation The purpose of short circuit calculation is to know the rating the interrupting capacity of the overcurrent protective device In circuit breaker there are 3 important parameters when it comes to residential design, ampere trip, ampere frame and interrupting rating Ampere trip – the current rating the circuit breaker set to trip Ampere frame – insulation housing for maximum long time current available in physical Interrupting Rating – the highest current at rated voltage that a device is intended to interrupt under standard test conditions.
Analogies to Short Circuit Condition Normal Current Operation Short Circuit Condition with Inadequate Interrupting Rating
Analogies to Short Circuit Condition Short Circuit with Adequate Interrupting Rating