BS 7769-1.1:1997:2002 Edition
$142.49
Electric cables. Calculation of the current rating. Current rating equations (100% load factor) and calculation of losses – General
| Published By | Publication Date | Number of Pages |
| BSI | 2002 | 32 |
Applicable to steady-state operation of cables at all alternating voltages and direct voltages up to 5 kV, buried as well as in air. This section provides formulae for current ratings and losses.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 1 | BRITISH STANDARD |
| 2 | Committees responsible for this British�Standard |
| 3 | Contents |
| 5 | 1 General 1.1 Scope |
| 6 | 1.2 Normative references 1.3 Symbols |
| 9 | 1.4 Permissible current rating of cables |
| 12 | 2 Calculation of losses 2.1 AC resistance of conductor |
| 14 | 2.2 Dielectric losses (applicable to a.c. cables only) |
| 15 | 2.3 Loss factor for sheath and screen |
| 22 | 2.4 Loss factor for armour, reinforcement and steel pipes (applicable to power frequency a.c. cables … |
| 27 | Table 1 – Electrical resistivities and temperature coefficients of metals used |
| 28 | Table 2 – Skin and proximity effects — Experimental values for the coefficients |
| 29 | Table 3 – Values of relative permittivity and loss factors for the insulation of high-voltage and medium-vo… |
| 30 | Table 4 – Absorption coefficient of solar radiation for cable surfaces |
