Basic Electrical Installation Work

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14. Figure 3. Room stat 2 2 C Blue (neutral) White Grey Grey White Orange Switch live (heating) Switch live (hot water) Neutral Earth 1 1 4 3 Cylinder stat Water control zone valve Boiler terminals Pump motor Programmer 230V 50Hz L L L N N N E E E On On Off Off Heating Hot water Orange Yellow/green FIGURE 3.Sources technical information and communications 69 electrical elements circuit. Freehand working diagrams Freehand working drawings sketches are another important way in which communicate our ideas.39) were done from freehand sketches.6 shows schematic diagram. should also contain all the dimensions necessary indicate clearly the size the finished object depicted the sketch. To convey the message information clearly better make your sketch large rather than too small. electrical schematic diagram looks very like circuit dia- gram. The drawings the spring toggle bolt in Chapter (Fig. . freehand sketch may done initial draft idea before full working draw- ing made.4 Wiring diagram space heating control system (Honeywell Plan). often much easier produce sketch your ideas or intentions than describe them produce list instructions. These help understand the working operation the circuit but are not helpful showing how wire the components