Domakihub How to Add a Fused Spur: What to Know Before You Call
Understand what a fused spur does, why you might need one, and when a licensed electrician must do the work.
Reviewed by Domakihub home & decor pros · 2026-06-23 · 5 min read
A fused spur, formally called a fused connection unit (FCU), lets you feed a fixed appliance directly from a ring-main circuit with its own built-in fuse and no plug required. The video above walks through the wiring method in detail; this guide explains what the job involves, what decisions need to be made beforehand, and why a certified electrician must carry out any work on mains circuits. Whether you own a home in Athens, a holiday villa on the islands, or manage a hotel property, understanding this fitting helps you brief an electrician confidently and avoid being overcharged for a straightforward task.
What Is a Fused Spur and Where Is It Used?
A fused connection unit is a wall-mounted outlet with an integral cartridge fuse, typically rated at 3 A or 13 A, wired directly into a ring final circuit without a plug or socket. Because the appliance is hardwired to it, there is no risk of accidentally disconnecting something that must stay live, which is why FCUs are standard on extractor fans, under-sink water heaters, dishwashers, electric towel rails, and security-system panels.
In Greek residential and hotel properties built or refurbished to British or northern-European specifications, FCUs appear wherever a continuously live, fuse-protected feed is safer than a socket outlet. They are equally common on equipment rails in commercial kitchens and in bathroom or plant-room locations where a socket outlet is not permitted by regulations.
Why This Job Requires a Qualified Electrician
Any work on a fixed mains electrical installation in Greece must be carried out by a licensed electrician (Ηλεκτρολόγος) who can certify the work and issue the required documentation. This is not a bureaucratic formality: incorrect connections on a ring circuit can cause sustained overloading, insulation damage, or fire, and an uncertified installation can void property insurance and create liability issues for landlords and hotel operators.
What you can usefully do yourself is prepare: identify the appliance you want to connect, measure the cable run from the nearest socket or junction point, choose a switched or unswitched FCU, and select the correct fuse value (3 A for loads up to 700 W such as extractor fans; 13 A for higher loads). Arriving at the appointment with these decisions made cuts the electrician's time on site and therefore your bill.
How the Job Is Done: The Five Stages Your Electrician Will Follow
- 1
Isolate and verify the circuit is dead
The electrician will switch off the relevant circuit breaker or remove the fuse at the consumer unit, then use a voltage tester to confirm there is no live voltage at the point of work. In older Greek properties the earthing and bonding arrangements will also be checked at this stage, since a floating earth is a common finding that must be corrected before any new connection is added.
- 2
Identify a suitable connection point on the ring main
A fused spur must be taken from a socket outlet that is genuinely on the ring, not from an existing spur socket (daisy-chaining spurs is not permitted under wiring regulations). The electrician will trace the cable with a continuity tester or by examining the consumer unit to confirm which sockets sit on the ring and which are already spurs.
- 3
Run new cable from the connection point to the FCU position
New 2.5 mm twin-and-earth cable (or the local metric equivalent) is routed from the identified ring socket to the chosen FCU location. In finished walls this usually means chasing a channel into the plaster, threading cable through conduit, or running along skirting in trunking. The route is planned to be as short and straight as possible and to avoid crossing other services.
- 4
Wire the FCU terminals: IN and LOAD sides
The FCU has six terminals arranged in two groups: three for the supply coming IN from the ring (live, neutral, earth) and three for the LOAD going OUT to the appliance. The brown live conductor goes to L IN, the blue neutral to N IN, and the bare or green-and-yellow earth to the earth terminal. On the load side the conductors connect identically: L LOAD, N LOAD, and earth. The cartridge fuse is then inserted and the faceplate secured.
- 5
Reinstate power, test, and certify
Once connections are made and covers are secured, the circuit is switched back on and the installation is tested with a multifunction tester: insulation resistance, earth continuity, and polarity are all verified. A competent electrician will issue a minor works certificate (or Greek equivalent compliance record) for the installation, which you should keep on file for insurance purposes and any future property sale.
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FAQ
- Can I add a fused spur myself in Greece?
- No. Work on a fixed mains installation in Greece must be carried out and certified by a licensed electrician (Ηλεκτρολόγος). Beyond the legal requirement, mistakes on a ring circuit can cause overloading or fire, and an uncertified installation can void your property insurance.
- What fuse rating should I choose: 3 A or 13 A?
- Use a 3 A fuse for loads up to roughly 700 W, which covers most extractor fans, doorbells, and clock timers. Choose a 13 A fuse for higher-draw appliances such as dishwashers, washing machines, and under-sink water heaters. When in doubt, check the appliance nameplate for its rated wattage and divide by 230 V to get the current draw.
- Can I take a fused spur from another spur socket?
- No. Wiring regulations require a fused spur to originate from a socket that sits on the ring main itself, not from a socket that is already a spur. Your electrician will verify this with a continuity test before making any connection. Taking a spur from a spur can overload the original spur cable and is a defect that will fail an electrical inspection.