Elbasen English version Guide to electrical installations Edition 2
SEK Handbok 436E Edition 2 June 2010 Elbasen - Guide to electrical installations Published by SEK Svensk Elstandard.
2010, SEK Svensk Elstandard SEK Svensk Elstandard is a non-profit organization responsible for the Swedish electrotechnical standardization and co-ordinates the Swedish participation in global and European standardization as the Swedish national committee of IEC and CENELEC. See also www.elstandard.se. SEK Handbok 436E Elbasen Guide to electrical installations Edition 2, 2010 ISBN: 978-91-89667-40-2 ISSN 0280-2376
Contents Foreword to the English edition 2 Foreword 3 1 Design 3 1.1 Basic dimensioning 3 1.2 Protective measures 10 2 Cables entering into the building and positioning of consumer units 10 2.1 Entry of cables 10 2.2 Switchgear assemblies 11 3 Wiring systems 16 3.1 Calculation of current carrying capacity, load and voltage drop 16 3.2 Implementation 25 3.3 Marking of wiring systems 27 3.4 Underground cables 30 3.5 Wiring systems with regard to the spread of fire 31 3.6 Protection against external damage 31 4 Earthing 32 4.1 Earthing systems 32 4.2 Protective earthing 32 4.3 Protective bonding 32 5 Protective and switching devices 36 5.1 Switching off 36 6 Different kinds of locations and environments 43 6.1 Dry locations 46 6.2 Locations containing bath or shower 48 6.3 Saunas 55 6.4 Humid, wet and outdoor locations 57 6.5 Locations for personal care, changing rooms 58 6.6 Laundry rooms 59 6.7 Garages (for one or two cars) and carports 60 6.8 ELV lighting 60 6.9 Telecommunication installations 61 6.10 Heating cable installations 66 7 Extension and maintenance of existing installations 67 7.1 Extension 67 7.2 Conversion 67 7.3 Changed use of the premises, resulting in changed safety requirements 67 7.4 Maintenance of older electrical installations 68 8 Initial verification 68 9 Principles of protection 70 10 Terms and definitions 73 11 Bibliography 87 1
Annex A Form for inspection of electrical installations 89 Table 1 (Simultaneity factor) Simultaneous load 4 Table 2 Socket-outlet positions 6 Table 3 Meter board sizes 15 Table 4 Disconnection times when using the protective measure Automatic discinnection of supply 17 Table 5 Current-carrying capacity in A at 30 C ambient temperature 18 Table 6 Correction factors for groups of conductors or several multi-conductor cables 20 Table 7 Relation between the rated current of the fuse and the current-carrying capacity of the conductor I z when overload protection is provided by the fuse 20 Table 8 Relation between the rated current of the MCB and the current-carrying capacity of the conductor I z when overload protection is provided by the MCB 21 Table 9 Maximum rated value of fuses used as short-circuit protection 21 Table 10 Selection of wiring system 26 Table 11 Suitable conduit size 27 Table 12 Core colours of cables with a green-and-yellow core 28 Table 13 Core colours of cables without a green-and-yellow core 29 Table 14 Colour of protective conductors and neutral conductors etc 29 Table 15 Nominal withstand of electrical equipment to overvoltage 42 Table 16 Elements of the IP code and their meanings 45 Table 17 Connection points for fixed electrical appliances in domestic kitchens 47 Table 18 Measures of protection in different zones of bathrooms and showers 53 Table 19 Degree of protection for electrical equipment in humid locations 57 Table 20 Degrees of protection in humid and wet locations and outdoors 58 Table 21 Minimum value of insulation resistance 69 Foreword to the English edition of Elbasen The name Elbasen is a pun in Swedish. It can means three different things. The most oblious is the electric bass. Another meaning is the base on which electricity relies and finally it can mean the boss of a team of electricians. In this publication the international practice with decimal commas is used throughout instead of decimal points. The reason being that this English version of Elbasen is produced for all non-swedish speakers who understand English and not only for native English speakers. 2
Foreword Elbasen is intended for people undertaking minor electrical installation work in homes, offices and in trade and commercial premises, where it is neither reasonable nor necessary to carry out advanced calculations. Consequently, Elbasen is simplified and does not take account of all the possibilities offered by the technical solutions set out in Swedish standards. The simplifications of the rules allow a generous safety margin. Elbasen has also been designed to ensure that the electrical installation will be functional and fit for its purpose from the user s point of view, with good electrical safety. The idea behind Elbasen is to offer a practical application of the rules under the system approach, with brief overall regulations and more detailed installation standards. The guidelines in Elbasen are designed to correspond to a level of electrical safety which at least conforms to the Wiring Rules (Swedish standard SS 436 40 00 Rules for Design and Erection of Electrical Installations). Elbasen consists primarily of edited extracts from the electrical installation standards and guidebooks listed in the bibliography at the end of this publication. Texts that originate from standards are indicated by a thin grey line in the inside margin ( ). Elbasen will be kept up to date by new editions in line with revisions to the installation standards on which it is based. Comments, suggestions for improvements and questions about the content may be sent to SEK. We hope you will find Elbasen useful and helpful in your work. 3