If you are using mains operated equipment out of doors (or even in a damp garage) you absolutely must have one of these appropriate to your country.

Heavy duty extension lead GFCI Surge Protection, SAFEMORE RCD extension lead With 3m Heavy duty Cable, 4 Gang 3680W, Plug Power Strip for...
4.0

Melyolpd RCD Extension Lead GFCI Surge Protected Extension Lead, 3M Heavy Duty Extension Lead with Leakage Protection 6 Way 3250W Plug RCD Power Strip for...
4.0

RCD Extension Lead with Earth Leakage Protection, SAFEMORE 4 Way Heavy Duty Power Strip with 3M Extension Cord/w Type A 30mA RCBO Protected Circuit Breaker...
5.0