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MessagePosté le: Dim 18 Juin - 18:40 (2017)    Sujet du message: Stallcup's Chapter Twenty Designing Electrical Systems - 20 Répondre en citant



Transformers

Transformers must be sized with enough capacity to supply power to loads and allow loads with high inrush currents to start and run. In addition, they must be protected by properly sized overcurrent protection devices and be equipped with conductors having allowable ampacity ratings to supply the loads. Overcurrent protection devices and conductors must be designed and installed in such a manner to safely protect the windings of such power sources from dangerous short circuits, ground faults, and overloads.

The overcurrent protection devices and conductors are sometimes required to be adjusted in size in order to protect the transformer windings or the conductors from overload conditions.

Transformers may be utility or customer owned and fall under the rules of the National Electrical Safety Code. If customer owned, they are still required to follow the National Electrical Safety Code as well as the National Electrical Code. And these requirements must be complied with.

Note, When selecting the actual size circuit breaker or fuse for the protection of electrical systems rated over 1000 volts, see one of the ANSI C Standards.

For example, for fuses rated at 100 amps or less, see ANSI C 37.46, and for over 100 amps see ANSI 37.46 and ANSI 37.40. When circuit breakers are used to protect high-voltage systems, see ANSI C 37.06. However, there may be protection designs that require reference to other ANSI C standards, and the designer must be prepared to refer to such standards.







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But, when they are, they must be wired using Class 1 wiring methods as outlined in 725.52(A), Example 2 and 725.42Extremely reader friendly, the text offers detailed explanations without being overly technical, and content clearly relates the NEC to real-world installation processes used by today?s professionalsIt's a powerful communication tool that helps you explain the NEC to clients and others who might not have professional electrical trainingDE-9781337101974 $122.95 Illustrated Guide to the NEC, 7E (2017) -This uniquely effective guide will help you master the 2017 National Electrical Code?For example, a cable can be protected from physical damage by routing it through a 10-foot length (short lengths per 300.12, ExThe fill area for a nipple is not the same as a racewayStep-by-step examples are used to simplify complex calculationsBonding and breaks down each of the Code articles that deal with this topicNote that such a sleeve does not have to be bonded to the equipment-grounding conductor in the protected cable as permitted by the provisions of 250.86, Ex- more 79c7fb41ad



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