Free notes
Filling in the schedule of circuit detailsWhat's the breaking capacity if the breaker says 6000?
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The notes
Exactly as they are on the site.
One per distribution board. A shed sub-board fed from the house board gets its own, and its “supplied from” is the house board, not the mains.
The top of the sheet: the board
Board reference and location, what it’s supplied from, the overcurrent device feeding it, the SPD type (T1, T2, T3 or N/A), and the RCD details if the board has one protecting everything.
One row per circuit
| Column | What goes in it |
|---|---|
| Circuit number and description | Every way on the board. Spares get a line drawn through, so nobody can add to the sheet later |
| Type of wiring | A code from the key at the bottom of the form (below) |
| Reference method | From BS 7671 Table 4A2: e.g. C clipped direct, B in conduit or trunking on a wall, 100–103 for twin and earth run through thermal insulation in ceilings or stud walls |
| Number of points served | The points of utilization on the circuit: sockets, luminaires, outlets |
| Live and CPC csa | e.g. 2.5 / 1.5 for a ring in twin and earth |
| Overcurrent device | BS (EN) number, type, rating, and breaking capacity in kA |
| Maximum permitted Zs | From the BS 7671 tables: B32 is 1.37 Ω, B6 is 7.28 Ω |
| RCD | BS (EN) number, type, IΔn and rating — or N/A if the circuit has none |
| Code | Wiring |
|---|---|
| A | Thermoplastic insulated and sheathed cables (twin and earth) |
| B | Thermoplastic cables in metallic conduit |
| C | Thermoplastic cables in non-metallic conduit |
| D | Thermoplastic cables in metallic trunking |
| E | Thermoplastic cables in non-metallic trunking |
| F | Thermoplastic SWA |
| G | Thermosetting SWA |
| H | Mineral insulated |
| O | Other — say what |
A circuit run in more than one wiring system gets more than one code.
A Type 3 SPD fitted to protect sensitive equipment goes in the Remarks column.
Guidance Note 3 · Fig 5.3 · p.149 · an example schedule BS 7671 · Table 41.3 · max Zs, circuit-breakers BS 7671 · Appendix 4 · Table 4A2 · reference methods
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