Costs

The costs for the electrical installations of a residential building depend on the type of building (single family house, semi-detached house or multi-family house) and on the standard of equipment, as well. Hence, it is not possible to figure out the additional expenses required for installing a bus system, in general.

Table 15.6.1 Costs for electrical installations with and without a bus system for different standards of equipment

Type of building

Equipment standard 1

Costs (Euros) Equipment standard 2

Equipment standard 3

Single family house

Conventional

9477

20,833

23,289

Bus system

12515

21,016

22,586

Difference

3038

183

-704

Semi-detached house

Conventional

7181

16,119

18,611

Bus system

8886

16,382

18,115

Difference

1706

262

-496

Multi-family house

Conventional

3422

7873

9147

Bus system

4434

8481

9959

Difference

1012

608

813

To provide an overview, the costs for different types of buildings and standards of building equipment that were determined in the study (Brillinger et al, 2001) are presented. The specified costs are the costs of electrical installation for a detached house, a semi-detached house (one half) and for an apartment in a multi-family residential building for three different standards of equipment in each case. Every variation of conventional electrical installation is compared to a variation with a bus system. The costs are compiled in Table 15.6.1. Costs include distribution, lines and devices installed. In the single family house, the costs for conventional electrical installations amount to €9477 (for the lowest level of equipment) and rise to €23,289 for the best standard of equipment. Costs for electrical installations including a bus system amount to €12,515 for the lowest level and are equal to €22,586 for the top level. For the poorest equipment standard, the additional costs for the bus system are 32 per cent higher: the difference amounts to €3038. As the standard of equipment improves, the difference between the conventional installation and the bus installation diminishes. At equipment standard 3, bus costs are even lower for the single family house. This is due to the fact that, at equipment standard 1, the conventional electrical installations are confined to the absolute minimum, and control handling is not very comfortable. The high demands implied by equipment level 3, however, would require enormous efforts and expenditure for installation works if a conventional system was to be installed. On the other hand, the installation of a bus system is expensive regarding costs for the basic equipment if not all functions are requested. At a high level of equipment, however, the advantages of a bus system can be fully utilized. For the semi-detached house and the multi-family dwelling house, the costs tend to be the same as for the single family house.

Bus systems are expensive regarding costs for the basic equipment, but they hold the option of subsequent expansion at a later date and offer the advantage of high versatility or flexibility. As the quality of equipment increases, the cost difference is reduced to a point where bus systems become less expensive than conventional installations.

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