NC2 ORAL QUESTIONING

• Types of conduits


  • Metallic non-flexible conduit such as: RMC, IMC, EMT conduits
  • Metallic flexible conduit
  • Non-metallic non-flexible conduit such as: PVC conduit
  • Non Metallic Flexible conduit
• Purpose of providing pull boxes

  For cable pulling, slicing, termination of wires
• Give at least 3 Types of protective devices to be worn on most job site

  • Hard hat
  • Safety gloves
  • Googles
  • Safety shoes
  • Apron
• Purpose of using electrician's knife instead of using pliers

  To avoid nicking the wire or less the number of strand that will cause the wire to heat up
• Purpose of using rubber tape in insulating barred conductor especially in outdoor installation

  For insulating barred conductor, first be rubber tape so that it does not absorb moisture when exposed
• Reason why it is not advisable to use water when extinguishing fire

  The main reason is that water may transmit electrical shock to the user
• Best move when using power tools in an installation

  Inspect and test if the power tools are in good condition and safe to use
• Examples of fittings used in the installation of conduit

  • Lock nut
  • Bushing
  • Straight connector
  • Condulet
  • Coupling
  • Conduit strap
• Enclosure


  A part providing an appropriate degree of protection of equipment against contains external influences and defined degree of contact with live parts any direction
• Types of service applied to a building

  • Service drop
  • Service entrance conductor
  • Service equipment
• What to do if the installation manual for the installing selector switch is not available

  If you are not familiar with the installation/replacement of the selector switch do not attempt to do it. Bring the matter to your immediate supervisor and ask for assistance
• Type of tool a portable grinder is considered as

  Type of power tool
• How grounding system can prevent someone from receiving electrical shock

  Grounding system has low resistance compared to a body. if there is a ground current it will tend to flow to the lower resistance, thereby preventing someone from receiving a shock
• How to protect the electrical system from lightning

  Install Transient voltage surge suppressor or lighting arrester
• Why fuse and circuit breaker cannot be used solely to protect against over load

  Fuse and circuit breaker sense the branch circuit current which is normally higher than the full load current. If there is an overload fuses and circuit breaker may not tripped and may damage the load
• Advantage of the digital multitester than analog multitester

  Digital multitester is more accurate than analog multitester due to its electronic components. It is easy to calibrate and more reliable
• Tools and equipment in installing pipe supports and fittings

  • Welding machine
  • Electric drill
  • Electric grinder
  • Small tools (Hack saw, hammer, etc.)
• Common causes of breakdown of electric drill

  • Worn out carbon brush
  • Burnt motor
  • Shafting is dragging or too much clearance
• Purpose of installing GFCI outlets

  GFCI outlets are usually installed in wet locations where a person may experience shock
• Basic components of lightning protection system

  • Lightning terminals
  • Down conductors
  • Grounding rod
• Acronym VOM as multitester

  • Voltmeter
  • Ohmmeter
  • Milliameter
• Different components of fire alarm system

  • Fire alarm control panel
  • Smoke detectors
  • Heat detector
  • Bell
  • Manual call point
• Basic components of CCTV

  • Camera
  • TV Monitor
  • Sequential switch
  • DVR
  • CCCTV adapters/jack/splitter
• Video entry phone

  A communication device which allow a person to identify a visitor through a picture image in a monitor
• 4 major parts of a door access control system

  • door lock
  • control system panel
  • biometric reader and controller
  • exit button
• Function of motion detector in a CCTV

  Part of auxiliary system that sets the motion trigger action individually each camera
• Wiring diagram in auxiliary device system

  A diagram that shows the actual location and termination of the auxiliary device
• PEC stands for Philippine electrical code