Ceiling Rose Wiring Diagram

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Understand how a UK ceiling rose wires up using the loop-in method — covering the loop, switch-live, and pendant terminals, correct core identification, and compliance with BS 7671.

A ceiling rose is the standard method used in the UK domestic wiring system for connecting a pendant light fitting to the fixed installation wiring. The vast majority of UK ceiling roses are wired using the loop-in method, in which the ring or radial lighting circuit cables loop through the rose terminal block rather than returning to a junction box. This approach minimises the number of connections in the circuit and is fully compliant with BS 7671 (IEC 60364 UK National Annex).

A typical loop-in ceiling rose contains three terminal groups: (1) the Loop terminal block (sometimes labelled L or Line), (2) the Switch-wire terminal block (sometimes labelled SW or Switch), and (3) the Pendant (Neutral) terminal block (sometimes labelled N). A separate earth terminal is also provided.

The incoming supply cable (and any onward loop cable to the next rose in the circuit) connects its brown (line) core to the Loop terminal and its blue (neutral) core to the Pendant/Neutral terminal. The switch cable runs from the Loop terminal (brown core — the permanent line) down to the switch, through the switch, and back as the switched live on the blue (or grey) core. Because the returning switched live is carried on a blue or grey core, BS 7671 requires this conductor to be sleeved or marked with brown sleeving or brown electrical tape at both ends to indicate it is a line conductor — this is the switch-live sleeve requirement that is frequently omitted in older installations and by inexperienced installers.

The switched-live core (now identified with brown sleeving) connects to the Switch terminal block. The pendant flex connects its brown (live) core to the Switch terminal block and its blue (neutral) core to the Pendant/Neutral terminal block, so that the luminaire is fed with switched live and neutral.

All earthing conductors must be insulated with green-and-yellow sleeving where bare, and must connect to the rose's earth terminal and to the earth core of the pendant flex (if the fitting has exposed metalwork).

No work on fixed lighting circuits in a UK dwelling may be carried out by an unqualified person unless it qualifies as like-for-like replacement under Part P of the Building Regulations (England and Wales) or equivalent devolved legislation. New circuits and new wiring must be notified to and certified by a registered competent-person scheme member or approved building control body.

How to wire ceiling rose diagram

Isolate and verify the circuit is dead Switch off the lighting circuit at the consumer unit (fuseboard) and lock or secure the way to prevent unintentional re-energisation. Use an approved voltage indicator or two-pole tester to prove the circuit is dead at the ceiling rose terminals. Do not rely on the light switch alone — the switch only breaks the switched-live, not the permanent line conductor in a loop-in circuit.
Remove the old rose and record the wiring Photograph the existing wiring before disconnecting any conductors. Note which core connects to which terminal block, and how many cables enter the rose. Count the cables: a mid-circuit rose has two cables (incoming loop and outgoing loop) plus the switch cable — three cables total. An end-of-circuit rose has one supply cable and one switch cable — two cables total.
Prepare cores and apply brown sleeving to switch-live Strip the outer sheath of each cable back sufficiently to reach the correct terminal without strain. Strip each core's insulation back approximately 8–10 mm. Fit green-and-yellow earth sleeving over any bare earth (CPC) conductors. Apply brown sleeving or brown electrical tape to both ends of the blue core in the switch cable to identify it as the switched line conductor.
Connect the Loop (Line) terminal block Connect the brown cores from all supply/loop cables to the Loop terminal block. In a mid-circuit rose this will be two brown cores (incoming and outgoing loop). In an end-of-circuit rose this will be one brown core plus the brown (or brown-sleeved blue) outgoing to the switch. Do not connect the pendant brown core to the Loop block — it connects to the Switch block.
Connect the Switch-live and Pendant terminal blocks Connect the brown-sleeved blue core (returning switched live) from the switch cable to the Switch terminal block. Connect the pendant flex brown core to the same Switch terminal block. Connect the blue (neutral) cores of all supply/loop cables and the pendant flex blue core to the Pendant (Neutral) terminal block.
Connect the earth conductors Connect all green-and-yellow earth conductors from supply cables and the switch cable to the earth terminal of the rose. If the pendant flex is used with a fitting that has exposed accessible metalwork, connect the pendant flex earth core to the earth terminal as well. Ensure the earth terminal screw is mechanically secure.
Reassemble, restore supply, and test Secure the ceiling rose canopy. Restore the circuit at the consumer unit. Operate the light switch and verify the luminaire illuminates and extinguishes correctly. Use a socket tester or loop impedance tester if available to verify the installation. Issue an Electrical Installation Certificate or Minor Electrical Installation Works Certificate if required by the applicable regulations.

Specifications

Applicable standard	BS 7671:2018+A2:2022 (Requirements for Electrical Installations — IEC 60364 UK National Annex)
Ceiling rose product standard	BS 67
Supply voltage (UK domestic)	230 V AC, 50 Hz (nominal)
Fixed cable type (typical UK domestic)	Flat two-core-and-earth PVC insulated and sheathed to BS 6004; 1.0 mm² or 1.5 mm² conductors
Conductor colour coding (post-2004 harmonised)	Brown = Line (live), Blue = Neutral, Green-and-yellow = Earth (CPC), Brown-sleeved blue = Switch-live
Maximum loop-in circuit load (domestic, 6 A MCB)	6 A (1380 W at 230 V) for the whole circuit; individual rose rated typically 6 A pendant load

Safety warnings

All work on fixed lighting circuits in UK domestic and commercial premises must comply with BS 7671 (Requirements for Electrical Installations). New circuit installation, circuit extensions, and wiring in special locations (bathrooms, outdoors) must be carried out by a person registered with a Part P competent-person scheme or notified to the local authority building control body.
Always isolate the circuit at the consumer unit and verify the circuit is dead with an approved two-pole voltage tester before touching any conductors at the ceiling rose. The loop-in method means that a permanent line conductor is present at the rose even when the light switch is in the off position.
Never omit brown sleeving on the switch-live (blue) core returning from the switch. An unmarked blue conductor carrying line voltage is a latent shock hazard for any person working on the circuit at a later date.
Ensure the earth (CPC) conductors are correctly connected and that all bare copper earth conductors are sleeved with green-and-yellow insulation. A fault to the metalwork of an unearthed fitting presents a lethal electric shock risk.
Do not overload the pendant flex or lamp holder. LED luminaires are recommended for their low heat output; incandescent or halogen lamps generate significant heat at the lamp holder and flex entry point and require appropriate T-rated components.

Tools needed

Approved two-pole voltage indicator or non-contact voltage tester (for proving dead)
Insulated electrician's screwdrivers (flathead and cross-head)
Wire strippers suitable for 1.0 mm² and 1.5 mm² cable
Side cutters
Pliers (for twisting multicore conductors before insertion in terminals)
Stepladder or platform appropriate for ceiling height
Camera or phone (to photograph existing wiring before disconnection)

Common mistakes

Connecting the switch-live returning blue core to the Neutral terminal block rather than the Switch terminal block, causing the light to be permanently on or creating a short circuit when the switch is operated.
Omitting brown sleeving on the returning switch-live blue core — this is a regulatory non-compliance (BS 7671 Regulation 514.3) and a latent hazard for future maintenance.
Connecting the pendant brown core to the Loop terminal instead of the Switch terminal, so that the pendant flex is fed with permanent live rather than switched live and the switch has no effect.
Leaving a bare (unsleeved) earth conductor exposed at the terminal — BS 7671 requires earth conductors to be insulated with green-and-yellow sleeving wherever they are accessible.
Overloading the pendant flex by fitting a lamp of higher wattage than the flex current rating — 0.5 mm² flex is rated for 3 A (approximately 700 W at 230 V), which is adequate for LED but may be insufficient for legacy incandescent loads.

Troubleshooting

Light is permanently on regardless of switch position: Cause: The pendant brown core is connected to the Loop terminal (permanent live) rather than the Switch terminal, or the switch cable connections at the switch plate are bridged Fix: Isolate the circuit and verify dead. Open the rose and check that the pendant brown core connects to the Switch terminal block, not the Loop block. Then check the switch plate — confirm the two terminals are not bridged and that the switch breaks the circuit correctly.
Light does not illuminate despite switch being on: Cause: Open circuit in the switch cable, failed lamp, reversed switch connections, or switch-live core connected to the Neutral terminal block in the rose Fix: Isolate and prove dead. With circuit live (and using a safe test method), check voltage at the Switch terminal block in the rose with the switch on — should be 230 V relative to neutral. If not, trace the switch cable for open circuit. Check lamp continuity. Replace lamp if required.
MCB or fuse trips immediately when circuit is restored: Cause: Short circuit between line and neutral or line and earth conductors inside the rose or at the switch connections Fix: Isolate and prove dead. Disconnect the pendant flex and test the circuit resistance. Sequentially disconnect each conductor from its terminal and retest to isolate the fault. Common causes are a bare CPC touching a line terminal or a switched-live core contacting the neutral terminal block.

Frequently asked questions

What are the three terminal groups inside a UK ceiling rose?

A standard UK loop-in ceiling rose has a Loop (Line) terminal block, a Switch-live terminal block, and a Pendant (Neutral) terminal block, plus an earth terminal. The Loop block carries the permanent line conductors from the incoming and outgoing circuit cables. The Switch block carries the switched live returning from the switch. The Pendant block carries the neutral conductors.

Why must the blue core in the switch cable be sleeved with brown?

In a two-core-and-earth switch cable, the blue core carries the switched line voltage from the switch back to the ceiling rose — it is a live conductor at switch-on. BS 7671 (Regulation 514.3) requires any conductor that is not its identified colour (blue = neutral) to be permanently marked with the correct colour at every termination. Brown sleeving or brown tape at both ends of the blue core identifies it correctly as a line conductor.

Can I use a ceiling rose for an LED driver or non-pendant fitting?

A ceiling rose is designed for a pendant flex suspension. For a directly ceiling-mounted fitting or an LED driver without a pendant, a BESA (conduit) box with a terminal block is the correct method. Ceiling roses should not be used to support the weight of heavy fittings beyond their rated suspension load, and they are not designed for transformer or driver mounting.

What wiring colours should I expect in an older UK installation?

Pre-2004 UK domestic wiring used red for line (live) and black for neutral in fixed cables, and red for switch-live in the switch cable return. Harmonised colours introduced under BS 7671:2008 changed these to brown (line), blue (neutral), and grey or blue with brown sleeving (switch-live). If you encounter old red/black cables in a rose, do not mix old and new colour conventions without re-labelling at every termination.

Do I need to notify building control when replacing a ceiling rose?

In England and Wales, like-for-like replacement of a ceiling rose in the same location is generally considered maintenance work not requiring building control notification under Part P. However, installing a new lighting point, extending a circuit, or replacing a rose in a special location (bathroom zone, outdoors) requires the work to be carried out by a registered competent person or notified to the local authority building control. Check current guidance from your local authority or a registered electrician.

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