Factor Table 10, single cables

Calculation factor according to German Standard VDE 0276-1000 (1999), Table 10, single cables, applicable to single-core cables in air with spacing of one cable diameter.

The factors are according to DIN VDE 0255:1972.
A cable tray is a continuous plate with walls on the side but without a cover.
A cable tray is considered with holes when the holes cover at least 30 % of the total plate surface.
In flat formation of cables with metallic screen or sheeth, the larger spacing between cables acts against increasing losses in screen/sheath. Therefore, no statement about reduction-free spacing can be given.

Symbol

$F_{T10,1}$

Unit

p.u.

Choices

arrangement	layers	systems 1	2	3
on the surface	1	0.92	0.89	0.88
tray without holes	1	0.92	0.89	0.88
	2	0.87	0.84	0.83
	3	0.84	0.82	0.81
	4	0.834	0.814	0.804
	5	0.827	0.807	0.797
	6	0.82	0.8	0.79
tray with holes	1	1.0	0.93	0.9
	2	0.97	0.89	0.85
	3	0.96	0.88	0.82
	4	0.954	0.87	0.814
	5	0.947	0.86	0.807
	6	0.94	0.85	0.8
horizontal ladder	1	1.0	0.97	0.96
	2	0.97	0.99	0.93
	3	0.96	0.98	0.92
	4	0.954	0.957	0.914
	5	0.947	0.933	0.907
	6	0.94	0.91	0.9
vertical supports	1	0.94	0.91	0.89
	2	0.94	0.9	0.86