Electrotechnical
In accordance with the Electricity at Work regulations, when considering whether to work live a responsible person should:
Carry out a risk assessment
Only work dead
Only work live
Do as the client demands
The normal procedure for working on electrical equipment should be which one of the following:
Dead working
Wearing insulated gloves
Using insulated tools
Live working
Test instruments used for working on electrical systems should:
Be yellow in colour
Be less than 10 years old
Have non-insulated test probes
Have insulated test probes
Under the Electricity at Work Regulations, live working is considered:
As entirely acceptable
To be normally permitted
Only to be allowed in exceptional circumstances
Never to be allowed
Which of the following would you use to replace the fuse in a plug if fuses were NOT available?
A nail
A piece of silver paper
A bit of wire
None of the options listed
To prove a circuit or equipment is dead after isolation what is the FIRST activity in the sequence of events?
Make sure equipment is not working
Check between Line and Earth
Check that the voltage detector is working on a proving device, known live source or in-built test feature
Check between line and neutral
The nominal single phase voltage in the UK is?
230 volts
240 volts
415 volts
400 volts
When is live working permissible?
When the person carrying out the work is a competent person
When it is unreasonable in all circumstances for the equipment to be made dead and suitable precautions are taken
When the means of isolation cannot be identified
When the person working on the equipment is wearing rubber gloves
Which of the following is NOT a requirement of low voltage safe isolation practice?
Ensuring that the correct point of isolation is identified
The person carrying out the work is issued with insulating gloves
A caution notice should be applied at the point of isolation
The conductors are proved to be dead at the point of work
the specific effects on the human body of a major electric shock are one of the following:
Dermatitis
Burns and cardiac arrest
Broken bones
Chest pains
The lowest level of electrical current which can harm the human body is normally measured in:
Microamps
Kiloamps
Amps
Milliamps
With regard to the effect of electrical current on the human body, one of the following is correct:
a 6 amp circuit breaker should prevent a person receiving a fatal electric shock
a 3 amp fuse should prevent a person receiving a fatal electric shock
a 30mA Residual Current Device (RCD) should prevent a person receiving a fatal electric shock
a 5 amp rewireable fuse should prevent a person receiving a fatal electric shock
Where mains voltage is used to supply portable equipment on a construction site, what additional protection is required?
Step-down transformer
Step-down generator
Cable avoidance tool
Residual current device (RCD)
What colour cable USUALLY signifies no volt power supply on site?
Black
Red
Blue
Yellow
A portable electric generator on site has two power outlets, no volts and 230 volts. What colour would the no volt outlet be?
Black
Yellow
Red
Blue
Where there is no local means of isolation for equipment or circuits to be worked on, which of the following is the preferred method of isolation?
Isolation of the main switch or DB switch-disconnector
Isolation of the individual circuit breaker or fuse
Pulling out the distributor's cut-out fuse
Disconnecting the individual circuit from the DB
What action should you take if a workmate gets an electric shock?
Phone the electricity board immediately
Dial 999 and for the fire brigade
Cut off the power and call for help
Try to pull them to safety
A residual current device is designed to operate in the event of one of the following:
Overload
Earth fault
Lightning strike on the supply
Short-circuit
Electrical installations on construction sites should be periodically inspected and tested:
Every 3 months
Every year
Every 6 months
Every month
The maximum AC voltage which the human body can withstand without long term physiological effects in dry conditions is:
110 volts
230 volts
50 volts
400 volts
Which of the following statements is true with regard to the dangers of electricity?
Electricity is perfectly safe so long as you wear cotton gloves
Electricity is only dangerous if you are not wearing wellington boots
Electricity is dangerous in wet weather
Electricity is dangerous at any time because you cannot tell by looking at a cable whether or not it is live
What is the most serious effect that electric shock can have if you come into contact with a live part?
The electric current can cause a slight tingling in the fingers
The electric current can cause burn marks on the fingers
The electric current can cause the heart to stop, resulting in dead
The electric current can cause the finger muscles to twitch
Your job involves you working near to hanging electrical cables which have bare ends. What should you do?
Touch the cables to see if they are live
Carry on working, as there shouldn't be a problem
Inform your supervisor and keep well away
Attempt to push the cables back into the ceiling void so that you can start work
For all live working activities it is necessary to:
Carry out a risk assessment as required by the EAW Regulations
Wear rubber gloves only
Be accompanied
Keep your fingers crossed
An electrical Permit to Work is primarily a statement that:
Someone else has taken responsibility for the work
The circuit or equipment is live
Certain instructions need to be followed
The circuit or equipment has been isolated and is safe to work on
The probes of voltage detectors and test instruments used on electrical systems should be:
Manufactured in the UK
Accompanied by a calibration certificate
Shaped or have barriers to prevent finger contact with the tips
Coloured red
Which of the following does the Electricity at Work (EAW) regulations apply to?
All persons engaged for work purposes
Self employed persons only
Employees only
Employers only
The Electricity at Work regulations require that:
Persons working with electricity must have the appropriate level of knowledge and experience
A training course is necessary before anyone can work with electricity
Only electricians can work with electricity
Anyone supervised can work with electricity
The Electricity at Work regulations apply to:
Only low voltage systems
Only extra-low voltage systems
All voltage systems
Only high voltage systems
Which of the following should be used to prove a circuit or equipment is dead after isolation?
A lamp holder with a length of flex attached
A proprietary test lamp or two pole voltage detector
A voltage stick
A multimeter
Which of the following is NOT a suitable means of isolating a circuit?
Removing a fuse and locking the distribution board
Putting insulating tape over the circuit breaker
Padlocking the isolating switch
Fitting a padlocked circuit breaker lockout
Which of the following work procedures on electrical systems will ALWAYS require a permit-to-work to be issued?
Dead working on low-voltage systems
Live working on low-voltage systems
Dead working on high-voltage systems
Live working on high-voltage systems
Optical fibre cable remnants should not be left lying around on site because:
They can be hot and burn upon contact
Laser beams still exist in the cut pieces
They can pierce the skin or eyes
They are toxic
Why should the end of an optical fibre cable never be pointed towards your own or anyone else's eyes?
The beam can transfer a strong electric current
The colour of the beam is very hyponotic
The beam can bore hole through the skin
The beam can damage the eyes
The use of a multi-lock hasp with the appropriate number of padlocks is a recommended method of safe isolation where:
Individual circuit breaker locking off devices are not available
Individual circuit breakers are not identified at the distribution board
More than one person will be working on circuits supplied from the same distribution board
You know the health and safety inspector is in the area
Which of the following procedures should be used when more than one person will be working on the circuits supplied from a distribution board which has been switched off?
The use of a multi-lock hasp on the isolator with a padlock for each operative
Blowing a horn before the power is switched on again
Giving each operative a volt stick
Telling everyone what time the power will be switched on again
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