At what temperature should my consumer unit be before I turn everything off?

Your consumer unit, sometimes called a fuse box, should be barely warm to the touch during everyday use. A slight warmth is normal because electricity passing through the components generates a small amount of heat, but it should never be hot enough to be uncomfortable when you briefly rest your hand near it, not on it. As a practical guide, most consumer units operate safely when their external surface temperature stays below around 55 to 60 degrees Celsius. Because the average room sits at around 20 degrees Celsius, that means a safe unit should not feel more than lukewarm. If it feels genuinely hot, something is wrong. Signs that your consumer unit may be overheating include: The plastic casing feels hot to a brief touch, not just warm. You can smell something burning, like hot plastic or a faintly acrid odour. You notice discolouration, scorch marks, or melting around one or more circuit breakers. A circuit breaker keeps tripping for no obvious reason. You hear crackling or buzzing from inside the unit. If you notice any of these signs, the safest action is to turn off the main switch at the consumer unit, unplug major appliances to reduce any chance of damage, and call a registered electrician straight away. Do not try to open the consumer unit yourself. The busbars and terminals inside can carry lethal voltages even when individual breakers appear to be off. Overheating is often caused by a loose connection, an overloaded circuit, a faulty breaker, or a unit that is simply too old. Consumer units installed before 2016 may not have the arc fault or surge protection now recommended under current UK wiring regulations. Do not wait to see if the problem resolves itself. An overheating consumer unit is one of the most common causes of electrical fires in UK homes. If in any doubt, turn it off and get it checked.