Cuadros eléctricos · Consumer units

Consumer unit upgrades in Tenerife

The consumer unit (cuadro eléctrico) is what separates a nuisance trip from a fire. In older Canarian apartments it is usually the weakest part of the whole installation.

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Signs yours has been outgrown

Porcelain fuses or breakers with no brand or rating visible
One RCD (diferencial) for the whole property
Main switch trips when A/C, oven and water heater run together
Scorch marks, warm breakers, loose cover
No labels: nobody knows which breaker does what
New loads planned: A/C, induction hob, EV charger, pool pump

What a proper board contains

Device	Purpose
IGA (main switch)	Isolates the installation, sized to the electrification grade
Surge protection (SPD)	Protects electronics from transient overvoltage
RCDs 30 mA, type A where needed	Protect people; each covers at most five circuits
Circuit breakers (PIA)	One per circuit, sized to the cable (10 A / 16 A / 20 A / 25 A)
Labels	Every breaker named, in English and Spanish

ITC-BT-25 circuit layout

Circuit	Use	Breaker	Cable
C1	Lighting	10 A	1.5 mm²
C2	General sockets	16 A	2.5 mm²
C3	Cooker and oven	25 A	6 mm²
C4	Washing machine, dishwasher, water heater	20 A	4 mm²
C5	Bathroom and kitchen sockets	16 A	2.5 mm²
C9	Air conditioning	25 A	6 mm²

Basic electrification: 5,750 W, minimum two RCDs. Elevated electrification: 9,200 W, minimum three RCDs; applies for example with air conditioning, electric heating or larger homes.

A new consumer unit on its own does not always mean the wiring behind it is fine. We test insulation on every circuit first, so the new board does not just start tripping on old faults.

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