Residential CGMP — Spanish REBT vivienda
Cuadro General de Mando y Protección for a Spanish residence per REBT ITC-BT-17 — acometida, contador/ICP, IGA, diferencial Tipo A 30 mA, and per-circuit PIAs (MCBs) feeding lighting, sockets, kitchen, washer, bathroom, and HVAC circuits with H07V-K cables.
For the Spanish or Latin American electrician
Scenario
A Spanish electrician (or an electrical-engineering student preparing the Esquema Unifilar for a course or permit) documents the Cuadro General de Mando y Protección (CGMP) of a single-family home. Spain's Reglamento Electrotécnico para Baja Tensión (REBT) §ITC-BT-17 is explicit about what the residential single-line must show: the incoming acometida, the utility-owned Interruptor de Control de Potencia (ICP) inside the meter cabinet, the consumer-owned Interruptor General Automático (IGA), one or more residual-current devices (Diferenciales), and a per-circuit Pequeño Interruptor Automático (PIA / MCB) for every final circuit — typically C1 through C6 in a basic grado de electrificación básica dwelling. The same pattern applies across Latin America (ABNT NBR 5410 in Brazil, NMX-J-098 in Mexico) and to most IEC-60364 jurisdictions, in contrast to NEC residential practice where the panel internals would normally live on a separate panel schedule.
Annotation key
utility [voltage:..., label:...]— Acometida: the 230 V single-phase service drop from the distribution network up to the meter cabinetwatthour_meter [label:...]— Contador + ICP: revenue meter and the utility's tamper-sealed power-limiter breaker (25 A here, contracted at 5.75 kW)breaker [rating:"…A curva C, …kA", label: "IGA"]— Interruptor General Automático: customer-owned main breaker; REBT requires curve C and ≥ 6 kA breaking capacity for residentialground_fault [rating: "…A / 30mA Tipo A", label: "Diferencial general"]— Type-A residual-current device tripping at 30 mA per ITC-BT-17 §1.2 (Tipo A covers AC + pulsating DC residual currents from electronics and inverter loads)bus [voltage: "230V", label: "Embarrado CGMP"]— common busbar inside the consumer unit; every PIA taps off this railbreaker [rating:"…A curva C", label: "PIA Cn"]— branch-circuit PIA: one MCB per final circuit, sized per ITC-BT-25 Table 1 (10 A lighting, 16 A general sockets, 20–25 A kitchen / washer / HVAC)load [label: "Cn …"]— the final circuit's loads grouped under their REBT circuit designation (C1–C6)[cable: "… mm² Cu H07V-K"]— conductor cross-sectional area, copper, single-core insulated H07V-K — the canonical cable type for residential indoor wiring per UNE-EN 50525
How to read
Power enters at the acometida and reaches the meter cabinet, where the utility's ICP enforces the contracted 5.75 kW power limit. Past the meter, the customer's CGMP begins: the IGA isolates the whole installation; the Diferencial general (40 A, 30 mA, Type A) trips on any earth-leakage fault to protect against electric shock per ITC-BT-24 §4.1; downstream of the differential, the busbar fans out to six branch circuits — lighting (1.5 mm²), general sockets (2.5 mm²), kitchen and oven (6 mm²), high-current appliances such as washer or dishwasher (4 mm²), bathroom and kitchen sockets (2.5 mm²), and the heat-pump / aerotermia (6 mm²). Each branch passes through its own PIA (curve C, sized per ITC-BT-25) before reaching the final circuit, so a fault in any one circuit drops only that circuit, not the whole dwelling. An REBT inspector reads this diagram top-down to verify selectivity (PIA < differential < IGA < ICP) and that conductor sizing matches PIA rating per the §ITC-BT-19 ampacity table.