Electrical Equipment Installations

FPN No. 3) ft is not good practice to install electrical equipment in Zone 0 locations except when the equipment is essential to the process or when other locations are not feasible. (See Section 500-2.) If it is necessary to install electrical systems in Zone 0 locations, it is good practice to install intrinsically safe systems as described by Article 504. 

Install electrical equipment according to the circuit voltage, current strength and the use of nature, and correct wiring. In acidic, hot, or humid places, it is necessary to use acid with anti-corrosion, high temperature, and moisture-resistant wires. 

Electrical contractors install equipment and systems in new buildings. Once a building is fully operational, the electrical contractor may provide a maintenance service to that client or customer or alternatively the client may employ an in-house electrician to maintain the installed electrical equipment. It all depends on the amount of work to be done and the complexity of the customers systems. 

Before beginning this final chapter on electrical installation wiring systems, the City and Guilds syllabus tells us to revise some of the work done in previous units because they are relevant to installing electrical equipment and systems in buildings. I will tell you where to find the appropriate revision material in this book. 

Integrity of installed electrical equipment maintained 1 Class I Division 2 installations provided with sealed devices. Explosion proof equipment provided or purged reliably and good electrical isolation between hazardous and nonhazardous areas. 

Electricians. They wire and install electrical equipment. 

Install electric equipment in a neat and workmanlike manner. 

Workmanship when installing electrical equipment such as wiring that is packed too tight could result in a fire hazard. 

The section entitles a supplier to rely on the safety-related research and testing already done by others. He does not have to repeat it. For example, an electrical contractor who installs electrical equipment such as a circuit breaker can relay on the assurances of the device s manufacturer that it has been made and tested to an appropriate British Standard. The contractor, however, retains responsibility for selecting the correct type of circuit breaker for the application ensuring, for example, that it has adequate breaking capacity for the prospective fault current. However, importers of foreign apparatus must satisfy themselves that the designer s or maker s assurances are valid. 

The major change introduced by the amendment was the concept of four zones, ranging from Zone 0 to Zone 3, which delineate the bath or shower room and in which the minimum ingress protection properties of installed electrical equipment are specified. The zones are illustrated in Fig. 10.1 for the straightforward situation of a bath tub in a bathroom. Reference should be made to the standard for the distribution of zones in more complicated situations. The most important requirements relating to these zones are detailed in Table 10.1. 

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