1. Electrical Safety 2: Checking Answers Fuse

2. Electrical Safety 2: Checking Answers Fuse Melts if too much current flows Protects against overloads and fires. Does NOT protect people against shocks

3. Electrical Safety 2: Checking Answers Thermal circuit breaker

4. Electrical Safety 2: Checking Answers Thermal circuit breaker Switches off if too much current flows. Works using a little heater inside

5. Electrical Safety 2: Checking Answers Magnetic circuit breaker

6. Electrical Safety 2: Checking Answers Magnetic circuit breaker Switches off if too much current flows. Works by a little electromagnet inside pulling a switch

7. Electrical Safety 2: Checking Answers RCD also called RCCBs or ELCBs One brand is “Power Breaker”

8. Electrical Safety 2: Checking Answers RCD also called RCCBs or ELCBs One brand is “Power Breaker” Use these with lawn mowers and anything else outdoors Switches off if the Live current and Neutral current are not equal Protects people from shocks – switches off before a lethal current flows through you.

9. Electrical Safety 2: Checking Answers Earthing

10. Electrical Safety 2: Checking Answers Earthing Normally this wire does nothing, but if there’s a fault the current goes this way instead of through me! If a machine has a metal case, this wire connects the case to the ground

11. Electrical Safety 2: Checking Answers Double insulation

12. Electrical Safety 2: Checking Answers Double insulation Plastic case, the machine has no exposed metal anywhere Does not need an earth wire

13. Electrical Safety 2: Checking Answers 1. When a fuse “blows”, I should fix the fault that caused it before I put in a new fuse because... (a) the new fuse will also blow (b) to remove any danger 2. Circuit breakers are more convenient than fuses because... they are easier to reset 3. Three appliances that need earthing: Two appliances that do not need earthing: e.g. fridge, freezer, computer, washing machine... e.g. hairdryer, TV... End