What temperature should my consumer unit be and when is it dangerous?

Is My Consumer Unit Too Hot? Your consumer unit (also called a fuse box) should feel slightly warm at most — never hot. A small amount of warmth is normal because electrical components generate a little heat during operation, but anything beyond that warrants attention. What is a normal temperature? In a room at around 20–25°C, the consumer unit surface should stay below 35°C — barely warm to a careful touch The internal components (busbars, breakers) should be no more than 10°C above ambient under normal load Anything you cannot comfortably hold your hand near for several seconds is too hot Warning signs you should never ignore: Hot to the touch on the casing or cover Burning smell — plastic, rubber, or a sharp electrical odour Discolouration or scorch marks around breakers or cables Breakers tripping repeatedly without an obvious cause Buzzing or crackling sounds from inside the unit Flickering lights throughout the property What you can safely check yourself: Stand back and look for any visible scorch marks or melting plastic on the outside Sniff carefully near (not touching) the unit for burning smells Check whether any breakers or RCDs have tripped — reset only if it is safe and you know why they tripped Check that the area around the unit is clear — units must not be enclosed in tight spaces that trap heat What you must NOT do: Do not open the consumer unit cover Do not attempt to replace breakers or fuses yourself Do not ignore the problem — overheating consumer units are a leading cause of house fires in the UK When to call an electrician immediately: If the unit is hot, smells of burning, shows any scorch marks, or if breakers keep tripping, turn off the main switch and call a Part P registered electrician right away. This is a potential C1 (danger present) situation under EICR inspection codes. Do not delay.