Recent claims data has shown Multi-boxes are a convenient way of providing electricity to applicances and generally speaking are relatively safe. However, they do pose a danger when overloaded or over-used.
Wear and tear on multi-boxes can be reduced by limiting the number of times plugs are taken in and out. Multi-boxes should never be used if damaged or not working properly. If possible buy multi-boxes with shuttereed outlets and an installed RCD.
