Observation

The expected answers include:

1. 1. Armoured Cable Part
   
   

   I - Tough PVC outer sheath

   
   

   II - Steel wire armouring

   
   

   III - PVC insulation

   
   

   IV - Copper conductor

   
   
   2. Precautions to be taken when Installing PVC Armoured Cable
   
   
   • PVC insulation must be protected against heat.
   
   
   • PVC tapes should be used for insulating the conductors.
   
   
   • Particular care must be taken with the cleaning and clamping of the galvanized steel wire armouring as it is often the sole earth continuity conductor/circuit protective conductor.
   
   
   • The temperature of a hot pouring compound should be controlled such that it does not melt the PVC insulation of the conductor.
   
   
   • Switch off/isolate the source before installation.
   
   
2. 1. Electrical Symbols

   I - ceiling fan

   
   

   II - 13 A socket outlet

   
   

   III - wall bracket

   
   

   IV - point of light/Lamp V - 15 A socket outlet

   
   

   VI - fan regulator

   
   

   VII - Distribution fuse board/consumer unit

   
   

   VIII - 2-way switch

   
   
   2. Reason for Location of VII/Distribution Fuse Board
      
      

      For easy access

   
   
3. 1. Errors in the Diagram
      

      • Ammeter wrongly connected in parallel instead of series
      
      
      • Voltmeter wrongly connected in series instead of parallel
      
      
   2. Implications of the Errors
   
   
   • The instruments will not read/work
   
   
   • The instruments could be damaged.
   
   
   3. 
   
   

   4. Types of Motor Enclosure

      
      
      • Totally enclosed.
      
      
      • Pipe ventilated.
      
      
      • Screen proof/protected.
      
      
      • Drip proof.
      
      
      • Open type enclosure.
      
      
      • Dust proof;
      
      
      • Flame proof.