Radial Socket Circuits

A radial circuit runs from the consumer unit to each socket in a single chain — unlike a ring, the cable does not return. Radials are common in modern kitchen circuits and smaller rooms.

Radial vs Ring

RadialRingdead end

Cable Sizes and MCB Ratings

| Cable size | MCB | Max sockets | |------------|-----|-------------| | 2.5mm² | 20A | Unlimited (20A circuit) | | 4mm² | 32A | Unlimited (32A circuit) |

Modern kitchens often use two 20A radials (one each side of the worktop) rather than a ring.

When to Use a Radial

  • Kitchen — appliances on dedicated circuits, separate radial per zone
  • Small rooms — a single radial is simpler than a ring for one or two sockets
  • Garages and workshops — often wired as a 20A radial

Key Differences from a Ring

  • The MCB rating matches the cable: 20A for 2.5mm², 32A for 4mm²
  • No spur rules — you can branch freely from any socket
  • The circuit has higher impedance at the far end (one path vs two)
⚡ Build a radial socket circuit on the canvas