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The given diagram is an example of:

A dimensioned wiring layout: a horizontal run marked 250, 150 and 300 (600 between the two vertical drops), drops of 450 with 3-wire marks, ending at switch symbols, and a lamp mark above the run.

  • A.installation plan
  • B.layout diagram
  • C.circuit diagram
  • D.wiring diagram

Answer: B

The diagram gives dimensions of the run of the conduit or wiring along a wall and ceiling, with the distances 250, 150, 300, 600 and 450 and the positions of points and fittings drawn to scale. A drawing of this kind, which shows where the points and the runs are placed in the building, is a layout diagram, option (B). An installation plan shows the whole installation on the building plan, a circuit diagram shows the electrical connections in symbols, and a wiring diagram shows the connections of the individual wires. The key gives the layout diagram.

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