26 Questions
What should be done if defects are detected in portable electrical equipment before use?
Immediately repair or replace the equipment
What should be done if broken switches or sockets are found in the electrical equipment?
Replace them immediately
When should electrical installation certificates be issued for installations?
For all installations by Qualified persons
What action should be taken if deficiencies are found in personal protective equipment before use?
Take the equipment out of service for inspection and testing
What safety requirements must be complied with prior to performing work on live electrical circuits?
Obtaining a Hot Work permit and preparing a JSA
Who is responsible for supervising the electrical isolation and works of different voltage ratings?
Operation and Electrical Maintenance Personnel
What must be done when de-energizing transformers according to the text?
Close the ground switches for both primary and secondary breakers
What form needs to be completed and approved by the fire section before work commences?
Fire interruption/isolation form
Under what circumstances should work on live electrical circuits be performed according to the text?
When possible alternatives are exhausted
What precaution should be taken when isolating transformers or machines with multiple supply sources?
Draw out their respective fuses
Who is allowed to enter enclosures with high voltage circuits exposed during operation?
Only Authorized Persons
Where should the keys of enclosures containing high voltage apparatus be kept?
Securely under lock with the Electrical Supervisor
What precaution must be taken regarding male plugs and connectors?
Properly seal and tighten them
How should live parts of electrical equipment operating at 50 volts or more be guarded?
Against accidental contact
What should be done to flexible cords according to the standard electrical codes?
Used in continuous lengths without splice and tap
Why should flood lights or light receptacles never be supported by their electrical cords?
Due to safety concerns, as cords are not designed for support
What should be ensured during daily inspections of temporary electrical facilities?
Inspecting for loose connections and decaying conditions
Why should temporary electrical equipment not be used as permanent equipment?
To avoid exposing workers to accidents
What's a crucial requirement for hand-held electrical equipment used in confined spaces?
Compliance with local/regional/international standards for equipment and voltage
What should be checked in grounding clamps and cables of temporary electrical equipment?
Decaying condition and tightness of connections
What is the minimum size requirement for the ground cables used during de-energization?
NO.2 AWG (35 mm2) copper
When should grounding clamps be attached to the conductors?
After the apparatus have been tested and confirmed to be de-energized
What is the maximum allowed ground resistance during grounding?
1.0 Ohm
Who is responsible for authorizing work on de-energized transmission and distribution circuits or apparatus?
The responsible Authorized Person of that facility
In what order should the conductors be grounded?
Nearest conductor to the worker first, followed by the succeeding conductor, and so forth
When should ground cables first be inspected and approved?
Before they could be connected to an effective ground
Test your knowledge on electrical safety precautions for isolating transformers and machines with multiple supply sources. Learn about entering enclosures containing high voltage circuits and the importance of isolating them from ground during operation.
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