Updated
Fuse Box Labels Missing Or Wrong
Your consumer unit has no labels, or the labels are wrong — making it impossible to identify which switch controls what.
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What's happening?
Every consumer unit should have a clear schedule (chart) showing which MCB or fuse controls which circuit. BS 7671 requires this as part of any electrical installation. When labels are missing or incorrect, you cannot identify which circuit to turn off in an emergency, which makes fault-finding difficult and emergency isolation potentially dangerous. Unlabelled boards are common in older installations or where work has been done without proper documentation.
What usually causes it?
- Labels were never fitted after the original installation or upgrade
- Circuit schedule has faded, fallen off, or been painted over
- Circuits have been added or changed without updating the labels
- DIY work has rearranged circuits without documentation
- Labels were fitted but are inaccurate due to changes over time
Is it dangerous?
Missing labels are a low-level safety issue in normal use, but they become a serious problem in an emergency. If you need to quickly isolate a specific circuit — for example, when someone is receiving an electric shock or there is a fault on one circuit — incorrect or missing labels mean you cannot identify the right switch. In an emergency, you may have to turn off the main switch, cutting all power.
Can I fix it myself?
You can attempt to identify circuits yourself by switching off each MCB one at a time and checking which lights, sockets, or appliances lose power. However, this takes time and you may miss circuits or make errors. A professional circuit identification and labelling is more reliable and includes proper testing.
When should you call an electrician?
Ask your electrician to label the board during any visit, as it is usually a quick addition to any job. A dedicated circuit identification visit is worthwhile if you have no idea what any of the switches control, or if an EICR has flagged the lack of labelling.
What will the electrician actually do?
- Systematically identify every circuit by testing and isolation
- Create and fit a circuit schedule (chart) on or near the consumer unit
- Check that all circuits are on the correct rated MCB
- Note any anomalies found during identification (shared circuits, unlisted circuits)
What will it cost to fix?
£60–£150
Circuit identification and labelling is a quick job in most homes. Costs are at the lower end for standard installations with fewer than 10 circuits.
Find an electricianFrequently asked questions
We’re happy to answer all your questions.
Is it a legal requirement to label the consumer unit?
BS 7671 requires a circuit schedule to be provided as part of any new installation or alteration. For existing installations, it is not illegal to have no labels, but it will be flagged on an EICR as a C3 observation (improvement recommended).
Can I label it myself?
You can, but only if you are certain of which circuit each MCB controls. Incorrect labelling is more dangerous than no labelling, as it could lead to someone working on what they think is an isolated circuit when it is actually live.
What information should the labels show?
Each MCB or fuse should be labelled with the circuit it protects (e.g., 'Upstairs Lights', 'Kitchen Sockets', 'Cooker'), the MCB rating, and the cable size. A proper circuit schedule also includes design and test data.
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