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Moray College HE Computing

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					DH2Y 34
Hardware Installation and
Maintenance
Electrical Safety
    The use of any item of electrical
      equipment carries a risk of
             electric shock
Electrical Faults
  Most electrical equipment just stops
  working, but some can develop faults

  Mains cables can become worn

  Motors can burn out and short circuit
Human Error

 Faults can be caused accidently.

 Someone cutting a cable

 Spilling liquids on electrical equipment
Dangers from electrical faults
  Fire

  Damage to other equipment

  Electric Shock
Electric Shock

  Electric shocks can be FATAL!
  When a person comes into contact with a
  live electrical component, the electricity
  finds a route to ground
  This can cause serious injury or death.
Effects of Electrical Shock
  Death
  Unconsciousness
  Burns
  Muscle Spasms
  Weakness
  Shallow breathing
  Rapid Pulse
Treatment of Electric Shock
  Ensure that it is safe to approach the casualty
  Switch off electricity at the plug
  Try to move them as little as possible
  Make sure that they are breathing and check
  their pulse
  If no pulse or breathing apply CPR
  If they are in shock keep them warm and
  loosen any tight clothing
Fuses
  Fuses are found in the main consumer unit in
  your house and at the plug on most devices

  Thin piece of wire which vaporizes if an overload
  of current runs through it

  Variety of sizes – 13amp very common

  If a fuse fails repeatedly there is probably a fault
  in the circuit
Circuit Breakers
  Electro mechanical devices

  Trip when an overload occurs

  Can be reset
Residual Current Devices
  Safeguards a person against electrical
  shock
  Detects when electricity is leaking from
  a circuit and breaks the circuit
  Sometimes combined with circuit
  breaker
  Also known as ELCB and GFCI
PAT Testing
  Portable Appliance Testing
  Visual Inspection
  Earth Continuity Test
  Insulation Test
  Carried out regularly, normally 12
  months

				
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