Glossary
Junction box (caja de registro, caja de empalmes)
A flush or surface box where the cables of the installation are joined and branched off. It is also called caja de empalmes or de derivación, and its lid must always stay accessible so the connections can be inspected.
What a caja de registro is
A caja de registro is the junction box where conduits meet and cables are joined: branches leave it for the lighting points, switches and sockets. Depending on the area it is also called caja de empalmes or caja de derivación. In Spanish flats (apartments) you usually see it as a round or square lid near the ceiling.
What it is for
- Joining cables with proper connectors, never with insulating tape alone.
- Splitting a circuit into several branches.
- Pulling new cables through from it.
- Giving access to inspect the wiring and trace faults.
Basic rules
- Accessible: the lid cannot end up hidden under tiles, sealed false ceilings or fitted furniture.
- Proper connectors: terminal blocks or push-in connectors suited to the cable size.
- Identifiable circuits: each circuit must be distinguishable inside the box.
- Big enough: a crammed box heats up and is hard to work in.
Faults that start in a junction box
In old installations many faults begin here: twisted joints wrapped in tape that have worked loose, cables scorched by a poor contact or damp coming in through the lid and tripping the RCD. If several rooms lose power at once, or you smell burning near a lid, the joint in that box is a suspect.
What the electrician does
When an installation is renewed, the old joints are replaced with new connectors, circuits are separated and damaged boxes are changed. See rewiring old apartments in Seville, Spain.
Related services
Rewiring old apartments
Rewiring an apartment in Seville, Spain is the answer when the installation is more than 25 or 30 years old: fabric or dried-out cables, no earthing, a single RCD and a supply that cannot run the air conditioning and the induction hob at once. We renew cables, conduits, fuse board, earthing and fittings and hand you the boletín.
Renovation electrics
If you are renovating your flat, renovation electrics in Seville, Spain are the moment to bring the installation up to the way you live today: new kitchen and bathroom circuits, fuse board, chases and conduits, light points where you need them and the boletín at the end. We work in coordination with your builder or renovation company.
Short circuit
If there has been a short circuit at home, with a flash, a smell of plastic or a circuit breaker that trips the moment you push it up, a short circuit electrician in Seville, Spain finds the exact point (cable, joint, socket, light fitting or appliance), repairs it and checks that the protections worked as they should.
Need an electrician in Seville, Spain?
Call us or send a WhatsApp message with a photo of the job. You get a fixed quote before any work starts.