AS/NZS 3008.1.1:2025

Table 3.33, 3.36, 3.38, 3.40, 3.42

Correction factors for bunched circuits, buried circuits and underground wiring enclosures

The cable size, correction factors and DC cable size tools read the grouping correction factor here for the arrangement you pick.

Verified: read against the printed standard, pages 73, 76, 78, 80, 82. Checked 27 Sept 2026.

Units: Circuits count

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Table 3.33, 3.36, 3.38, 3.40, 3.42, Correction factors for bunched circuits, buried circuits and underground wiring enclosures
Medium	Arrangement	Circuits (count)	Factor	Or more	Touching	Spaced 015	Spaced 030	Spaced 045	Spaced 060	Trefoil touching	Laid flat touching
air	bunched-on-surface-or-enclosed	1	1
air	bunched-on-surface-or-enclosed	2	0.8
air	bunched-on-surface-or-enclosed	3	0.7
air	bunched-on-surface-or-enclosed	4	0.65
air	bunched-on-surface-or-enclosed	5	0.6
air	bunched-on-surface-or-enclosed	6	0.57
air	bunched-on-surface-or-enclosed	7	0.54
air	bunched-on-surface-or-enclosed	8	0.52
air	bunched-on-surface-or-enclosed	9	0.5
air	bunched-on-surface-or-enclosed	10	0.48
air	bunched-on-surface-or-enclosed	12	0.45
air	bunched-on-surface-or-enclosed	14	0.43
air	bunched-on-surface-or-enclosed	16	0.41
air	bunched-on-surface-or-enclosed	18	0.39
air	bunched-on-surface-or-enclosed	20	0.38	yes
air	bunched-in-air	1	1
air	bunched-in-air	2	0.87
air	bunched-in-air	3	0.75
air	bunched-in-air	4	0.72
air	bunched-in-air	5	0.7
air	bunched-in-air	6	0.67
air	single-layer-wall-touching	1	1
air	single-layer-wall-touching	2	0.85
air	single-layer-wall-touching	3	0.79
air	single-layer-wall-touching	4	0.75
air	single-layer-wall-touching	5	0.73
air	single-layer-wall-touching	6	0.72
air	single-layer-wall-touching	7	0.71
air	single-layer-wall-touching	8	0.7
air	single-layer-wall-touching	9	0.7
air	single-layer-wall-touching	10	0.7
air	single-layer-wall-touching	12	0.7
air	single-layer-wall-touching	14	0.7
air	single-layer-wall-touching	16	0.7
air	single-layer-wall-touching	18	0.7
air	single-layer-wall-touching	20	0.7	yes
air	single-layer-wall-spaced	1	1
air	single-layer-wall-spaced	2	0.94
air	single-layer-wall-spaced	3	0.9
air	single-layer-wall-spaced	4	0.9
air	single-layer-wall-spaced	5	0.9
air	single-layer-wall-spaced	6	0.9
air	single-layer-wall-spaced	7	0.9
air	single-layer-wall-spaced	8	0.9
air	single-layer-wall-spaced	9	0.9
air	single-layer-wall-spaced	10	0.9
air	single-layer-wall-spaced	12	0.9
air	single-layer-wall-spaced	14	0.9
air	single-layer-wall-spaced	16	0.9
air	single-layer-wall-spaced	18	0.9
air	single-layer-wall-spaced	20	0.9	yes
air	single-layer-ceiling-touching	1	0.95
air	single-layer-ceiling-touching	2	0.81
air	single-layer-ceiling-touching	3	0.72
air	single-layer-ceiling-touching	4	0.68
air	single-layer-ceiling-touching	5	0.66
air	single-layer-ceiling-touching	6	0.64
air	single-layer-ceiling-touching	7	0.62
air	single-layer-ceiling-touching	8	0.61
air	single-layer-ceiling-touching	9	0.61
air	single-layer-ceiling-touching	10	0.61
air	single-layer-ceiling-touching	12	0.61
air	single-layer-ceiling-touching	14	0.61
air	single-layer-ceiling-touching	16	0.61
air	single-layer-ceiling-touching	18	0.61
air	single-layer-ceiling-touching	20	0.61	yes
air	single-layer-ceiling-spaced	1	0.95
air	single-layer-ceiling-spaced	2	0.85
air	single-layer-ceiling-spaced	3	0.85
air	single-layer-ceiling-spaced	4	0.85
air	single-layer-ceiling-spaced	5	0.85
air	single-layer-ceiling-spaced	6	0.85
air	single-layer-ceiling-spaced	7	0.85
air	single-layer-ceiling-spaced	8	0.85
air	single-layer-ceiling-spaced	9	0.85
air	single-layer-ceiling-spaced	10	0.85
air	single-layer-ceiling-spaced	12	0.85
air	single-layer-ceiling-spaced	14	0.85
air	single-layer-ceiling-spaced	16	0.85
air	single-layer-ceiling-spaced	18	0.85
air	single-layer-ceiling-spaced	20	0.85	yes
buried	multicore-buried-direct	1	1		1	1	1	1	1
buried	multicore-buried-direct	2	0.81		0.81	0.87	0.91	0.93	0.95
buried	multicore-buried-direct	3	0.7		0.7	0.78	0.84	0.88	0.9
buried	multicore-buried-direct	4	0.63		0.63	0.74	0.81	0.86	0.89
buried	multicore-buried-direct	5	0.59		0.59	0.7	0.78	0.84	0.87
buried	multicore-buried-direct	6	0.55		0.55	0.68	0.77	0.83	0.87
buried	multicore-buried-direct	7	0.52		0.52	0.66	0.75	0.82	0.86
buried	multicore-buried-direct	8	0.5		0.5	0.64	0.75	0.81	0.86
buried	multicore-buried-direct	9	0.48		0.48	0.63	0.74	0.81	0.85
buried	multicore-buried-direct	10	0.47		0.47	0.62	0.73	0.8	0.85
buried	multicore-buried-direct	11	0.45		0.45	0.61	0.73	0.8	0.85
buried	multicore-buried-direct	12	0.44		0.44	0.6	0.72	0.8	0.84
buried	single‑core-buried-direct	1	1							1	1
buried	single‑core-buried-direct	2	0.78							0.78	0.81
buried	single‑core-buried-direct	3	0.66							0.66	0.7
buried	single‑core-buried-direct	4	0.61							0.61	0.64
buried	single‑core-buried-direct	5	0.56							0.56	0.6
buried	single‑core-buried-direct	6	0.53							0.53	0.57
buried	single‑core-buried-direct	7	0.5							0.5	0.54
buried	single‑core-buried-direct	8	0.49							0.49	0.53
buried	single‑core-buried-direct	9	0.47							0.47	0.51
buried	single‑core-buried-direct	10	0.46							0.46	0.5
buried	single‑core-buried-direct	11	0.44							0.44	0.49
buried	single‑core-buried-direct	12	0.43							0.43	0.48
buried	single‑core-separate-enclosures	1	1		1			1	1
buried	single‑core-separate-enclosures	2	0.87		0.87			0.91	0.93
buried	single‑core-separate-enclosures	3	0.78		0.78			0.84	0.87
buried	single‑core-separate-enclosures	4	0.74		0.74			0.81	0.85
buried	single‑core-separate-enclosures	5	0.7		0.7			0.79	0.83
buried	single‑core-separate-enclosures	6	0.69		0.69			0.78	0.82
buried	single‑core-separate-enclosures	7	0.67		0.67			0.76	0.82
buried	single‑core-separate-enclosures	8	0.66		0.66			0.76	0.81
buried	single‑core-separate-enclosures	9	0.65		0.65			0.75	0.81
buried	single‑core-separate-enclosures	10	0.64		0.64			0.75	0.8
buried	single‑core-separate-enclosures	11	0.63		0.63			0.74	0.8
buried	single‑core-separate-enclosures	12	0.63		0.63			0.74	0.8
buried	multicore-separate-enclosures	1	1		1		1	1	1
buried	multicore-separate-enclosures	2	0.9		0.9		0.93	0.95	0.96
buried	multicore-separate-enclosures	3	0.83		0.83		0.88	0.91	0.93
buried	multicore-separate-enclosures	4	0.79		0.79		0.85	0.89	0.92
buried	multicore-separate-enclosures	5	0.75		0.75		0.83	0.88	0.91
buried	multicore-separate-enclosures	6	0.73		0.73		0.82	0.87	0.9
buried	multicore-separate-enclosures	7	0.71		0.71		0.81	0.86	0.89
buried	multicore-separate-enclosures	8	0.7		0.7		0.8	0.85	0.89
buried	multicore-separate-enclosures	9	0.68		0.68		0.79	0.85	0.89
buried	multicore-separate-enclosures	10	0.67		0.67		0.79	0.85	0.89
buried	multicore-separate-enclosures	11	0.66		0.66		0.78	0.84	0.88
buried	multicore-separate-enclosures	12	0.66		0.66		0.78	0.84	0.88

Cables

Protection

Loads

Power

Solar

Safety

Earthing

Testing

Fire

Regulatory

Table 3.33, 3.36, 3.38, 3.40, 3.42

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