Switched fused connection unit FCU electrical symbol BS EN 60617 — what it represents, where it appears in UK electrical drawings, and how it relates to the rest of the symbol library.
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Written and reviewed by Andrew Moore, founder of Elec-Mate, against BS 7671:2018+A4:2026, IET Guidance Note 3 and the IET On-Site Guide.
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A Fused Connection Unit with a front-panel switch + neon indicator. Allows local isolation of the fixed appliance without resorting to the consumer unit. Most common FCU type.
Used in: Towel rails, immersion heaters, garden lighting, alarms, garage door operators.
See all socket outlet symbols →Right-click the symbol above to save the SVG, or use the AI Diagram Builder to drop it into a working drawing.
A Fused Connection Unit with a front-panel switch + neon indicator. Allows local isolation of the fixed appliance without resorting to the consumer unit. Most common FCU type.
Towel rails, immersion heaters, garden lighting, alarms, garage door operators.
For the full set of socket outlet symbols, see the Socket Outlet Symbols reference page — covering every related symbol with the same level of installation context.
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Start free trialOther socket outlet symbols you may need on the same drawing:
A single 13A switched socket to BS 1363. The basic socket symbol — a semicircle with a line indicating switched. UK standard for general-purpose socket circuits.
Used in: General-purpose outlets, behind appliances, individual radial circuits, kitchen specifics.
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A twin 13A switched socket — two outlets on one back box. Drawn as two semicircles back-to-back. Standard outlet for living spaces, bedrooms and offices.
Used in: Bedrooms (typically 2-4 doubles), living rooms, kitchens, offices — the workhorse outlet.
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A Fused Connection Unit (FCU) with internal fuse providing local protection for a fixed appliance. Unswitched version — no front rocker. Used where switching is not needed at the spur.
Used in: Boilers, extractor fans, central heating pumps, doorbells, fixed wireless access points.
See all socket outlet symbols →A Fused Connection Unit with a front-panel switch + neon indicator. Allows local isolation of the fixed appliance without resorting to the consumer unit. Most common FCU type.
Used in: Towel rails, immersion heaters, garden lighting, alarms, garage door operators.
See all socket outlet symbols →
A connection outlet without integral fuse — relies on the upstream circuit fuse or breaker for protection. Often a flex outlet plate for permanently-wired flex-connected appliances.
Used in: Flex outlets behind built-in ovens (separately fused), wall-hung TVs, fixed kitchen kit.
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A 45A cooker connection point — usually a 45A DP switch with optional 13A socket above the worktop, feeding the cooker outlet plate behind the appliance.
Used in: Electric range cookers, double ovens, hobs over 7.2 kW; supplied on its own radial circuit.
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A bathroom-compliant socket with built-in isolating transformer to BS EN 61558-2-5. Permitted in bathroom zone 2 because the transformer galvanically isolates the user from earth.
Used in: Bathrooms, en-suites, hotel rooms — the only socket type permitted in bathroom zones.
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A 13A socket outlet with integrated USB-A or USB-C charging ports. Combines mains and low-voltage charging in one back box. Specify USB-C PD for modern devices.
Used in: Bedside, desks, hotel rooms, kitchen islands — anywhere phones and tablets need charging.
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A structured cabling outlet to BS EN 50173. Cat 5e (1 Gb/s), Cat 6 (1 Gb/s longer reach), or Cat 6A (10 Gb/s). Terminated in an RJ45 module.
Used in: Office desks, WiFi access points, CCTV camera locations, hard-wired smart home devices.
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A telephone master or extension socket. UK master socket has BT engineer test socket; extensions are wired to the master. Increasingly replaced by RJ45 data sockets.
Used in: Legacy phone wiring, fax machines, alarm phone diallers, FTTC modems.
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A coaxial outlet for TV aerial, FM/DAB radio or satellite. Multi-output back boxes can combine TV + FM + satellite in one face plate.
Used in: Living rooms, bedrooms, kitchens; satellite outlets need separate F-type connectors.
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A communications/networking cabinet — typically a 12U or 18U wall-mounted rack housing the patch panel, network switch, router and structured-cabling termination.
Used in: Loft, plant room, under-stairs; central termination point for all data sockets in a building.
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An electric vehicle charge point to BS 7671 Section 722. Typically 7.2 kW single-phase or 22 kW three-phase, with Type 2 (Mennekes) socket or tethered lead.
Used in: Driveways, car parks, fleet depots; needs dedicated circuit + Type A RCD or RDC-DD per 722.531.
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A weatherproof socket to IP66 ingress protection. Hinged cover seals against dust and powerful water jets. Must be RCD protected per BS 7671.
Used in: Gardens, sheds, outdoor power tools, Christmas lights, pond pumps, EV charging from a standard socket.
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A flush-mounted socket installed in the floor — typically a floor box with two 13A sockets and data outlets. Used in open-plan offices where wall outlets are too distant.
Used in: Open-plan offices, conference rooms, retail floor displays, exhibition halls.
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