The danger in overloading an extension lead or cord

…Infrastructure Maintenance with Tunde Obileye

Almost every home is likely to have one or more extension lead or cord trailing through parts of the house. When limited to just a handful of sockets in any room, it can prove challenging to supply power to all the essential appliances.

While extension leads and cords are, undoubtedly, useful, they can also pose significant danger. Numerous household devices require too much power for an extension lead or cord to manage safely.

According to various reports, a large number of house fires occur annually due to faulty wiring and overloaded sockets.

Extension leads have a maximum load rating, and high-draw appliances like kettles, toasters and electric heaters are among the worst appliances that can be plugged into them. Often times, people

don’t realize how much electric current these devices pull and when multiple devices are on one extension lead, the risk of a real fire is present.

Beyond the fire hazard posed by overloading, another concern relates to the quality of the extension leads and cords themselves. Extension leads or cords are required to carry safety markings and built-in fuses.

If they don’t carry the appropriate safety markings, there is no guarantee they will cut out before overheating. This is when the situation moves from an inconvenience to a genuine fire hazard.

In Nigeria, extension leads and cords are primarily regulated by the Standard Organization of Nigeria (SON) and the Nigerian Electricity Management Services Agency (NEMSA).

It is important to verify these products are marked with NIS certification tags before buying. Counterfeit or substandard cords and leads frequently fail core-size and electrical resistivity tests making them fall well short of this standard.

If reliance on extension leads and cords is necessary throughout a home, the safest long-term fix is to have additional sockets fitted by a qualified electrician to make sure all high-wattage appliances are plugged directly into the wall.

The immediate and long-term consequences of overloading sockets include:

•Electrical Fires: This is the most severe risk. Overheating can start a fire inside the walls or behind the socket, making it difficult to detect until it spreads.

•Damaged Electronics: Persistent overloading causes voltage drops, which can severely damage sensitive equipment like computers, televisions, and refrigerator compressors.

•Melted Components: The extreme heat can melt the socket’s plastic components and wiring insulation, exposing live parts.

•Electric Shock Risks: Melted or broken socket casing exposes live wires, creating a severe electric shock hazard for anyone touching the outlet.

•Tripped Breakers: Repeated overloads cause circuit breakers to trip or fuses to blow. While these are safety features, constant tripping can degrade the breaker, making it less reliable.

There are warning signs of an overload before a major failure occurs and these red flags include but not limited to the following:

•Plugs or wall plates that feel warm or hot to the touch.

•Burning smells or melting plastic odors.

•Scorch marks or discoloration on the socket.

•Buzzing, crackling, or hissing sounds.

•Lights that dim or flicker when you turn on an appliance.

To prevent these hazards, the use of one heat-producing appliance such as heaters, irons, or hair dryers per wall socket is highly recommended. Overloading can be avoided by making sure never to plug one extension lead into another.

Most people have multi-way extension leads in their homes, to increase the number of appliances that they can plug into a wall socket. However, although there is space to plug in a number of appliances, it does not mean it s always safe to do so.