[FONT=&]1. [/FONT][FONT=&]What are the main types, their advantages and limitations of different electrical connections?[/FONT]
[FONT=&]All terminations must be of the appropriate size and shape for the conductors terminating to them.[/FONT]
[FONT=&]Pillar terminals are most common. The conductor should fill the terminal. Over tightening can damage the thread, split the screw head and damage the conductor. Nut and washer type requires the cables to be formed around the thread and secured between an eye and washer. The conductor must not be too large for the eye. [/FONT]
[FONT=&]Shaping the conductor in the wrong direction (i.e. Anti clockwise), will tend to undo the conductor from the termination.[/FONT]
[FONT=&]Connectors similar to the pillar terminal method and often an additional clamp arrangement inside the connector.[/FONT]
[FONT=&]Crimps are compressed terminations. The correct size of crimp and clamping arrangement must be used for a secure connection.[/FONT]
[FONT=&]All of the above require appropriate insulation and identification. All terminations should be firmly made on the conductor. This will prevent high resistance joints that could lead to overheating and fire. There should not be any exposed conductor from the termination.[/FONT]
[FONT=&]2. [/FONT][FONT=&]What are the implications on the choice of connections with regard to permanent or temporary purposes?[/FONT]
[FONT=&]Any electrical termination must be mechanically strong and electrically sound and fit for purpose. Any screwed connection must be accessible. Only solid connections e.g. soldered, crimped, brazed, even welded, none of which need not be accessible.[/FONT]
[FONT=&]All must have appropriate and adequate insulation to prevent ‘direct’ contact.(basic protection)[/FONT]
[FONT=&]This applies to both temporary and permanent connections.[/FONT]
[FONT=&]EAWR – Taped joints are not permitted.[/FONT]
[FONT=&]3. [/FONT][FONT=&]What are the requirements of joints and connections to be of strength and conductance to allow for the passage of fault currents and to prevent corrosion?[/FONT]
[FONT=&]Any joint or connection should not introduce any more resistance than that of the conductor itself. All terminations should be appropriate to the environment (e.g. high ambient temperatures). Where aluminium conductors are used appropriate terminations are needed to prevent corrosion.[/FONT]
[FONT=&]All conductors and terminations should be designed and selected to be suitable for handling fault currents for the duration of the fault in compliance with BS7671.[/FONT]
[FONT=&]4. [/FONT][FONT=&]What is the importance of using personal protective equipment and safe appropriate tools for specific jobs?[/FONT]
[FONT=&]The use of PPE is a legal requirement under the HASAWA. Also the ‘Personal Protective Equipment at Work’ regulations 1992. Risk assessments determine the type of PPE required in a particular situation. Remember that PPE is the last line of defence from hazards (injury).[/FONT]
[FONT=&]The safe and appropriate use of tools involves training in their proper use.[/FONT]
[FONT=&]Using the correct tool for the task![/FONT]
[FONT=&]Keeping tools well maintained, i.e. Sharpe; handles securely fitted; insulation on hand tools not compromised.[/FONT]
[FONT=&]Other equipment must comply with the EAWR.[/FONT]
[FONT=&]5. [/FONT][FONT=&]What part of the IEE wiring regulations as specified in the latest British Standard for Electrical Installations are relevant to types and uses of wiring systems, wiring enclosures and equipment?[/FONT]
[FONT=&]BS7671 – to install electrical installations in a safe manner as detailed in the wiring regulations and associated guidance notes.[/FONT]
[FONT=&]These documents set out the standard for installations and with the guidance notes how that standard is achieved.[/FONT]
[FONT=&]No part of the regulations is exempted from these requirements. There are however other authorities and bodies that can impose higher requirements (part one of the regs.)[/FONT]
[FONT=&]6. [/FONT][FONT=&]Where would you find out about the principles of electrical theory, which allow for the safe installation of electrical wiring systems, wiring enclosures and equipment?[/FONT]
[FONT=&]This should be done in line with the training and development of skills under supervision. Following manufacturers instructions and data sheets. In addition there are many practical textbooks that provide good guidance on installation techniques. This is normally provided through relevant training courses (e.g. C&G 2330).[/FONT]