A Sudoku with a difference, solve the clues, then solve the puzzle!.
Ten minutes = Good work, your hired!
Fifteen minutes = OK not too bad.
Twenty minutes = when shall we book you in for a course?
A = nominal rating in Amperes for a standard domestic lighting circuit mcb.
B = this part of BS7671 details special locations and installations.
C = IPX ? is suitable for permanent submersion.
D = number of live conductors in a standard radial circuit.
E = approximate tabulated Zs value for a 5A BS3036 for a 0.4s disconnection time.
F = number of circuits that can be covered on a single Minor Electrical Installation Works Certificate.
G = standard disconnection time for a reduced low-voltage system in seconds.
H = number of 'steps' to carry out continuity testing on a ring final circuit.
I = number of live conductors supplying a standard three-phase distribution board.