Rating Factors

The current rating mentioned in above tables based on ambient temperature 30°C in accordance with IET Wiring regulations for Electrical Installations, BS 7671.

Rating Factor for variation in Ambient Air Temperature.

Air Temperature (°C)	25	30	35	40	45	50	55	60
Rating Factor	1.02	1.00	0.96	0.91	0.87	0.82	0.76	0.71

Rating Factor for one circuit or one multicore cable or for group of circuits or a group of multicore cables.

Arrangement (cable Touching)	Number of Circuits or Multicore Cables
Arrangement (cable Touching)	1	2	3	4	5	6	7	8	9	12	16	20
Bunched in Air, on a surface, embedded or enclosed	1.00	0.80	0.70	0.65	0.60	0.57	0.54	0.52	0.50	0.45	0.41	0.38
Single layer on wall or floor	1.00	0.85	0.79	0.75	0.73	0.72	0.72	0.71	0.70	0.70	0.70	0.70
Single layer multicore on a perforated horizontal or vertical cable tray system	1.00	0.88	0.82	0.77	0..75	0.73	0.73	0.72	0.72	0.72	0.72	0.72
Single layer multicore on cable ladder system or cleats etc.	1.00	0.87	0.82	0.80	0.80	0.79	0.79	0.78	0.78	0.78	0.78	0.78

Minimum Bending Radius

Single Core Multi Core Cable
Armoured -8 x OD Armoured -8 x OD
Un Armoured - 6 x OD Un Armoured - 8 x OD
Where ‘OD’ is overall diameter of cable Where ‘OD’ is overall diameter of cable

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