AS/NZS 3000:2018

Table C6, C7

Simplified protective device selection for 1 to 25 mm² cables

The simplified selector reads the largest protective device rating Tables C6 and C7 allow for a conductor size. It reads one for each installation condition the tables separate, for circuits of one phase and of three.

Verified: read against the printed standard, pages 478–479. Checked 26 Sept 2026.

Units: Size mm2, Rating A

These are the values AmpSize encodes. No text of the standard is reproduced. Verify against the current standard.

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16 rows

Table C6, C7, Simplified protective device selection for 1 to 25 mm² cables
Phases	Size (mm2)	In air unenclosed	Thermal insulation partial	Thermal insulation complete	In air enclosed	In ground enclosed
1	1	16	10	8	13	16
1	1.5	20	16	10	16	20
1	2.5	25	20	16	20	32
1	4	32	25	20	25	40
1	6	40	32	25	32	50
1	10	63	50	32	50	63
1	16	80	63	40	63	80
1	25	100	80	50	80	100
3	1	13	10	6	13	16
3	1.5	16	13	8	16	20
3	2.5	20	16	10	20	25
3	4	32	20	16	25	32
3	6	40	32	20	32	40
3	10	50	40	25	40	50
3	16	63	50	32	63	63
3	25	80	63	40	80	80

Tools that read it (1)

Simplified Selector

Cables

Protection

Loads

Power

Solar

Safety

Earthing

Testing

Fire

Regulatory

Table C6, C7

Tools that read it (1)

Phases	Size (mm2)	In air unenclosed	Thermal insulation partial	Thermal insulation complete	In air enclosed	In ground enclosed
1	1	16	10	8	13	16
1	1.5	20	16	10	16	20
1	2.5	25	20	16	20	32
1	4	32	25	20	25	40
1	6	40	32	25	32	50
1	10	63	50	32	50	63
1	16	80	63	40	63	80
1	25	100	80	50	80	100
3	1	13	10	6	13	16
3	1.5	16	13	8	16	20
3	2.5	20	16	10	20	25
3	4	32	20	16	25	32
3	6	40	32	20	32	40
3	10	50	40	25	40	50
3	16	63	50	32	63	63
3	25	80	63	40	80	80

Phases	Size (mm2)	In air unenclosed	Thermal insulation partial	Thermal insulation complete	In air enclosed	In ground enclosed
1	1	16	10	8	13	16
1	1.5	20	16	10	16	20
1	2.5	25	20	16	20	32
1	4	32	25	20	25	40
1	6	40	32	25	32	50
1	10	63	50	32	50	63
1	16	80	63	40	63	80
1	25	100	80	50	80	100
3	1	13	10	6	13	16
3	1.5	16	13	8	16	20
3	2.5	20	16	10	20	25
3	4	32	20	16	25	32
3	6	40	32	20	32	40
3	10	50	40	25	40	50
3	16	63	50	32	63	63
3	25	80	63	40	80	80

Phases	Size (mm2)	In air unenclosed	Thermal insulation partial	Thermal insulation complete	In air enclosed	In ground enclosed
1	1	16	10	8	13	16
1	1.5	20	16	10	16	20
1	2.5	25	20	16	20	32
1	4	32	25	20	25	40
1	6	40	32	25	32	50
1	10	63	50	32	50	63
1	16	80	63	40	63	80
1	25	100	80	50	80	100
3	1	13	10	6	13	16
3	1.5	16	13	8	16	20
3	2.5	20	16	10	20	25
3	4	32	20	16	25	32
3	6	40	32	20	32	40
3	10	50	40	25	40	50
3	16	63	50	32	63	63
3	25	80	63	40	80	80