Wiring Accessories Energy & Environment.

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Presentation transcript:

Wiring Accessories Energy & Environment

Electrical Accessories Why might we use electrical accessories? Protection Adjustment of resistance Control The standard current ratings of the accessories are 6, 16 & 32 ampere The voltage rating is 240V AC

Switches Manually operated device for closing & opening a circuit. Single Pole Switch Two Way Switch Stair case wiring U D C Off On Bell Push Spring loaded push button Used in bell circuit

Switches Double Pole Switch 10amp, 16amp, 32amp Double pole switch + fuse + fuse link + neon indicator 10amp, 16amp, 32amp 250v only Used as main switches to control a main or branch circuit in domestic installation

3 Pin Plug What are these wires called and what do they do? Earth Takes current to ground if appliance has fault Live Provides current to appliance 6A 250V or 16A, 250V Fuse Neutral Fuse blows if unsafe current passed through Returns current to power source Outer Insulation

The Earth Wire: How does it work? If the live wire becomes loose and touches the metal casing what will happen? The metal casing will act as a live wire as it can conduct electricity. Because of the nature of electricity it will try and travel to the ground. What would happen if you were touching the cooker?

The Earth Wire: How does it work? If you were touching the appliance the electricity would travel through you and give you an electric shock The earth wire is connected to the metal casing and has a lower resistance than you so carries the current to the ground The earth wire has a very low resistance. Therefore the current is increased. This blows the fuse and creates an open circuit. Ω Ω

2 Pin Plug What wire is missing? Some appliances such as electric drills do not need an earth wire. You cannot get a shock from these appliances even if the wires inside become loose. This is because the casing is made from plastic. These are Double insulated. 6 amps & 250V

Fuse The fuse is to create a short circuit in the event of too much current It is important that the fuse matches the power rating of the appliance If power <720W If power >720W

Summary Questions Explain what the wires in a plug do Why is it important to have an earth wire? When do you not need an earth plug? What do fuses do?