Symbols of Contact Units
Because a wiring diagram should limit itself to the reproduction of the essentials, the symbols for contact units should show just enough so that it is easily recognisable and cannot be mixed.
1 -> Current source
2 -> Conductor
3 -> Switch
4 -> Ground
5 -> Light bulb
6 -> Light bulb with two light fixings
7 -> Tension meter
(Voltmeter)
8 -> Ammetre
9 -> Resistance
10 -> Fuse
11 -> Wire (fixed)
12 -> Wire (not fixed)
1 -> Diode
2 -> PNP-transistor
3 -> NPN-transistor
4 -> Rheostat
5 -> Condenser
6 -> Power relay
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