Electrical Level Three Exam - Module 26306-20
Questions with Correct Answers | Rated A+
Key Components of Distribution Equipment
• Busbars: Conductive bars used to distribute electrical power. Common materials include
uncoated copper and tin-plated aluminum, which provide good conductivity and
resistance to corrosion.
• Switchgear: Essential for switching and protecting electrical equipment. It isolates faulty
components and provides grounding for safety.
• Transformers: Devices that reduce voltage levels for metering equipment, including
distribution and instrument transformers. They ensure safe and manageable voltage
levels for various applications.
Electrical Safety and Faults
• Ground Faults: Occur when there is an unintended path between the source of current
and the grounded surface. They can lead to dangerous situations and require immediate
attention.
• Short Circuits: A fault condition where current bypasses the normal load, potentially
causing equipment damage or fire.
• Thermographic Surveys: Used to detect hot spots in electrical systems, indicating
potential failures. A gradient of 12°C or more is a major deficiency.
Testing and Maintenance Procedures
Testing Methods
• Insulation Resistance Test: Measures the resistance of electrical insulation to ensure it is
functioning properly and safely.
• Heat Scanning Test: Identifies loose connections and overheating components, which
can lead to failures.
• Resistance Checks: Switchgear resistance should be checked using a 600V megger to
ensure proper operation.
Ground Fault Detection
Questions with Correct Answers | Rated A+
Key Components of Distribution Equipment
• Busbars: Conductive bars used to distribute electrical power. Common materials include
uncoated copper and tin-plated aluminum, which provide good conductivity and
resistance to corrosion.
• Switchgear: Essential for switching and protecting electrical equipment. It isolates faulty
components and provides grounding for safety.
• Transformers: Devices that reduce voltage levels for metering equipment, including
distribution and instrument transformers. They ensure safe and manageable voltage
levels for various applications.
Electrical Safety and Faults
• Ground Faults: Occur when there is an unintended path between the source of current
and the grounded surface. They can lead to dangerous situations and require immediate
attention.
• Short Circuits: A fault condition where current bypasses the normal load, potentially
causing equipment damage or fire.
• Thermographic Surveys: Used to detect hot spots in electrical systems, indicating
potential failures. A gradient of 12°C or more is a major deficiency.
Testing and Maintenance Procedures
Testing Methods
• Insulation Resistance Test: Measures the resistance of electrical insulation to ensure it is
functioning properly and safely.
• Heat Scanning Test: Identifies loose connections and overheating components, which
can lead to failures.
• Resistance Checks: Switchgear resistance should be checked using a 600V megger to
ensure proper operation.
Ground Fault Detection
