WorksheetsElectrical Safety Worksheet
Total questions: 20
Worksheet time: 10mins
Basic protection against electric shock is by eliminating the possibility of coming into contact with a live part, usually by the use of insulation or barriers or enclosures.
True
False
Don’t know
A colleague suffers an electric shock when using an electric drill. Your first action ‘if safe to do so’ is:
pull the drill away from them
call the emergency services
inform your supervisor
switch the power supply off
Calculate the current from a 230 V AC supply and a body resistance of 3,000 Ω.
13A
76mA
13mA
76A
Which time/current zone represents the most serious hazard to the human body, including ventricular fibrillation, cardiac arrest and death.
Zone 1
Zone 2
Zone 3
Zone 4
The main electrical hazards are:
contact with live parts causing shock and burns
faults which could cause fire
fire or explosion where electricity could be the source of ignition
All the above
In the case of working on industrial trucks we consider high voltage as to be above:
up to and including 1000vac / 1500vdc
above 50Vac/120Vdc
up to and including 400vac / 750vdc
in excess of 1500vac / 1000vdc
Identify the Non-Statutory Regulations from the following list which impact electrical installation systems:
Health and Safety at Work Act 1974
Electricity at Work Regulations 1989
The IEE Regulations BS 7671: 2018
The BSI Kite Safety Mark.
What component is used to verify the test meter is functioning correctly?
Megger
A volt meter
A Battery and bulb
Proving unit or use a known power source
What category (CAT) meter would be best suited in diagnosing an AC motor fault on MHE with potential high transient voltages?
CAT I
CAT II
CAT III
CAT VI
Mult-meter test leads and probes should be in compliance with:
HSE GS83
HSE GS38
HSE38
GSE38
It is strongly recommended probes should be:
Insulated to leave an exposed metal tip not exceeding 3 mm measured across any surface of the tip.
Insulated to leave an exposed metal tip not exceeding 1 mm measured across any surface of the tip.
Insulated to leave an exposed metal tip not exceeding 2 mm measured across any surface of the tip.
Insulated to leave an exposed metal tip not exceeding 4 mm measured across any surface of the tip.
Which of the following PPE is required for high voltage electrical?
face shields
overalls with non-conductive fasteners
safety footwear with rubber soles and non-metallic toe caps
Insulated gloves
All of the above
What voltage should the electrical tooling being insulated too?
500V
1000mV
1000V
750V
Protection against electric shock from direct contact is:
Enclosure of live conductors
Circuit protected by an RCD
The circuit is earthed
What are the requirements before commencing any work on a HV system?
To be competent
Have the correct PPE and insulated tooling
Isolated circuit (lock out / tag out)
Completed a risk assessment
All of the above
A short circuit is defined as:
an undercurrent resulting from a fault of negligible impedance between live conductors
an overcurrent resulting from a fault of negligible impedance between live conductors
an overcurrent resulting from a fault of negligible impedance between live and earth conductors
A current which exceeds the rated current in an otherwise healthy circuit is one definition of:
fault protection
an overcurrent
a short-circuit current
an overload current
Once the power source has been isolated, how do you inform others to ensure the system will not be reenergised?
Display warning notices (tagout)
Lockout isolator (lockout)
Lockout isolator (lockout) & Display warning notices (tagout)
How long should be allowed for capacitors to discharge before commencing work
5 minutes
20 minutes
Follow manufacturers recommendations
There is no requirement to wait, its isolated
Identify potential high voltage that could be stored or generated on MH equipment
Capacitors
Regen braking
AC Motors and controllers
All of the above
