Chapter A General rules of electrical installation design

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B40 © Schneider Electric - all rights reserved B - Connection to the MV public distribution network Fig. B39 : Outdoor substations without enclosures 6 Constitution of MV/LV distribution substations Outdoor substations without enclosures (see Fig. B39) These kinds of outdoor substation are common in some countries, based on weatherproof equipment exposed to the elements. These substations comprise a fenced area in which three or more concrete plinths are installed for: b A ring-main unit, or one or more switch-fuse or circuit-breaker unit(s) b One or more transformer(s), and b One or more LV distribution panel(s). Pole mounted substations Field of application These substations are mainly used to supply isolated rural consumers from MV overhead line distribution systems. Constitution In this type of substation, most often, the MV transformer protection is provided by fuses. Lightning arresters are provided, however, to protect the transformer and consumers as shown in Figure B40. General arrangement of equipment As previously noted the location of the substation must allow easy access, not only for personnel but for equipment handling (raising the transformer, for example) and the manœuvring of heavy vehicles. LV circuit breaker D1 Safety earth mat Fig. B40 : Pole-mounted transformer substation Schneider Electric - Electrical installation guide 2008 Lightning arresters Earthing conductor 25 mm 2 copper Protective conductor cover
2 Chapter C Connection to the LV utility distribution network Contents Low-voltage utility distribution networks C2 1.1 Low-voltage consumers C2 1.2 Low-voltage distribution networks C10 1.3 The consumer service connection C11 1.4 Quality of supply voltage C15 Tariffs and metering C 6 Schneider Electric - Electrical installation guide 2008 C © Schneider Electric - all rights reserved
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General rules of electrical install
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Chapter A General rules of electrical installation design

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