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
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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.
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Voltage Drop Calculation Voltage Drop Calculation: %VD = IR Voltage Supply (V 3 ) x100% where: I – line current, amperes R – line ac resistance, ohms
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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.
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Analogies to Short Circuit Condition Normal Current Operation Short Circuit Condition with Inadequate Interrupting Rating
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Analogies to Short Circuit Condition Short Circuit with Adequate Interrupting Rating
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