EWRB Theory Exam Prep Questions and Correct Answers

What is the minimum value of the permitted test result for the insulation resistance test of a three-phase, 400V, mains cable? 1MΩ When carrying out testing on a low voltage electrical installation, which document details the tests and checks required to be carried out? AS/NZS 3000 What is the minimum or maximum test result value you would consider acceptable for an Earth Continuity test? 1Ω or less State TWO types of electrical protection provided by a RCBO. ANY TWO: - Earth Leakage - Overload - Short Circuit If the voltage and current are known, what TWO other factors are required to calculate the power consumed by a three-phase motor? √3 & Power Factor What type of single-phase motor can be reversed by reversing the connections to the run winding? ANY ONE: - Split-Phase Motor - Capacitor Start Motor - Cap-Start, Cap-Run Motor What type of single-phase motor can be reversed by reversing the connections to the armature brushes? ANY ONE: - Universal Motor - Series Motor State ONE reason why the metal frame of a Class 1 electrical appliance is earthed. ANY ONE: - To ensure the operation of a protective device under fault conditions. - To keep the frame of the appliance at earth potential under fault conditions. State TWO factors that determine the severity of electric shock upon the human body. ANY TWO: - Voltage Applied - Shock Current Level - Contact Duration - Skin Dryness - Current Path