Radial circuit
A circuit that runs outward from the distribution board, feeding each point in turn, and simply ends at the last one — no return leg. Radials are the default worldwide and are simpler to design, test and fault-find than rings; UK practice uses them for lighting, dedicated appliances and increasingly for socket circuits too.
Where Radial circuit fits in the learning path
The Installation section covers these units:
- Wiring Systems & Enclosures
- Cable Selection & Circuit Design
- Earthing, Bonding & Consumer Units
Curriculum mapping: C&G 2365 Units 203/204/305.
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A socket circuit wired as a loop, so load current shares two paths. The cable leaves the consumer unit, visits each socket in turn and returns to the same protective device. A UK signature design, it serves a large floor area from modest cable — and demands its own three-step continuity test, because a broken ring keeps working silently as two overloaded radials.
Ring final circuit
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Ring final circuit
A socket circuit wired as a loop, so load current shares two paths. The cable leaves the consumer unit, visits each socket in turn and returns to the same protective device. A UK signature design, it serves a large floor area from modest cable — and demands its own three-step continuity test, because a broken ring keeps working silently as two overloaded radials.
Read the Ring final circuit entryMCB — Miniature Circuit Breaker
An automatic switch that turns a circuit off when too much current flows, whether a slow overload or a sudden short circuit. It has replaced the rewirable fuse in modern boards. Each one is chosen by its current rating, such as 6 A for lights or 32 A for sockets, and by its type: B for most home circuits, C or D where equipment draws a big surge as it starts.
Read the MCB entryA definition is a start. Using it in a real question is where it sticks.