Generators flameproof

A similar situation exists for the particles generated by fault current arcing in flameproof enclosures after passing the flameproof joints (see Section 6.8). 

In consequence, e motors, generators, transformers and reactors designed for the common rated supply voltages 500, 690 V and 1000 V are not suitable for very low power ratings. Smaller conductor diameters ask for another type of protection, e.g. flameproof enclosure - d -, encapsulation - m or powder filling - q -, the last mentioned restricted to transformers and reactors. 

Compared with rotating machines in increased safety - e there are no additional requirements for the windings or for the gap between stator core and rotor. The interior of flameproof motors and generators is identical... 

Figure 6.138 Automatic directional drilling system. All electrical components are fitted into flameproof compartments inside the steel body Length (without drilling head) 2000 mm Diameter 216 mm Speed 60 min-1 Drilling depth 600 m Drilling pressure 181 Weight (without drilling head) approx. 300 kg IP code IP 68 Generator 48 V DC 2 A.

Use Flameproofing agent for textiles and certain grades of paper, weed and brush killer, electroplating, generation of nitrous oxide. 

Areas having inflammable vapours should have flameproof lighting. Avoid proximity of high-wattage lamps to units in such areas as the vapours can ignite due to the heat generated by such lighting. 

Dust is created, not only when solid material is worked on, but also whenever materials are moved or handled. A dust presents a higher fire risk than the solid because of its greater contact area with air with resultant lower ignition characteristics. A dust cloud has many of the fire characteristics of a gas. Accumulations of dust should be removed as quickly as possible by techniques which do not generate a dust cloud, i.e. damp sweeping or vacuum cleaning. The electrical equipment in areas where flammable solids and powders are handled or occur must be designed and maintained to the appropriate flameproof standard. 

Aii soivents shouid be used with care in weii-ventiiated areas, or in fume cupboards if at aii possibie. Soivents shouid never be evaporated or distiiied on an open bench. Some operations generate more vapour than others, and fiitration is probabiy the procedure which produces most. When not in use, aii soivents shouid be stored in weii-stoppered botties, made of dark giass, and in flameproof cabinets. No more soivent than is required for immediate needs shouid be stored in the iaboratory. in generai, care shouid be taken to prevent spiiiages, to keep storage vesseis dosed, and generaiiy to minimise any exposure of the iaboratory personnei to soivent vapours. 

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