Safety with an RCD on an extension lead
Your house should be wired to specifications which demand certain safety features. However, when you use an extension cord from the house or take a hand-held appliance outdoors, you put yourself at some risk. For example, in
taking your electric hair-straightening irons out onto a wet terrace in the warm sun you could end up with straight hair much sooner than anticipated.
Using an electric mower, chainsaw or hedge clippers on wet lawn, puts you at risk of the moisture arcing the electric current and causing electric shock. To protect yourself in any situation where you use an appliance outdoors, buy
yourself an RCD unit (residual current device), which simply plugs into the socket before you plug in the appliance. It has a TEST and a RESET button on it. If your appliance becomes faulty for any reason, it’ll automatically cut off the
power, protecting you from harm. See Electricity supply and What to do if a few lights go out.