Element 6 Electrical Flashcards
Outline practical measures to reduce the risk from electricity when using portable electrical equipment
Perform visual inspections before every use and ensure that the equipmnet is inpsected and tested inline with use. The vsiual check will ensure there are no bare wires visable, the cable covering is not damaged and the plug is in good condition.
Use the correct equipment for the task and the environment. Use double insulated equipment and reduce the voltage where possible. It is now common to use 110V electrical equipment on construction sites.
Ensure the user has the required training, instruction and is aware of the risks and there is adequate supervision.
Outline the items that should be included in the electrical permit to work
The permit to work for electrical work should include equipmnet and plant to be used, isolated and worked on. Type of work to be carried out ( maintenance, repairs or inspections) and any potential hazards and control measures.
All permits to be issued by authorised person and recieved by competent person
Outline precautions to be taken before lifting operations are carried out adjacent to high voltage overhead powerlines
The network operator should be informed and where possible the power supply isoltaed or switched off, the owner of the lines will advise a safe distance and barriers should be set out to identify this. The lift should be planned by a competent person inlcuding the correct crane selected for the lift and an appointed person shuld manage operations. The provision of goalposts and bunting to identfy teh safe headroom can be set out.
Describe how reduced low voltage systems reduce the risk of electric shock and give an example of their application
Reduced low voltage equipment reduce the risk of electric shock and supply special 110v appliance which operate from 55-0-55V centre tap transformers. Harm is greatly reduced using low voltage equipment. Another example would be battery operate d appliances such as drills and saw. This provides both reduced voltage and eliminates cables
Identify factors that must be met to justify ‘live’ electrical work
No live work should be carried out unless:
- it is unreasonable for the equipment to be dead
- It is reasonable for the work to take place on or near live conductors
- Suitable precautions have been taken to prevent injury
Oultine procedures that should be followed when planning to work on ‘dead’ electrical systems
Adequate precautions must be taken to ensure that electrical systems or equipment made dead cannot be switched on again during work. A keyed safety lock out system should be inplace to isolate the supply to the system.
Isolation should be carried out by a competent person, and only competent persons should be installing, altering, testing or maintaining electrical systems
