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IEEE C37.12-2008 pdf free

IEEE C37.12-2008 pdf free.IEEE Guide for Specifications of High-Voltage Circuit Breakers (over 1000 Volts).
The developer of thc specification should sclect a lbmat for the specification. There are two prcvalern formats although many variations are possible.
— A complete specification written for a specific circuit breaker order, or
— A set of companion documents that are to be used together. The first document is a general specification that applies to a class or classes of circuit breakers. This general specification is accompanied by a second.supplementary specification that provides only those details that are appropna(c for the specific circuit breaker order. This second ‘rating specification” includes information such as the ratings, delivery quantities, schedule and locations, special requirements applicable to the specific order, unusual conditions and perhaps exceptions to the general specification
The specification should generally include a statement that requires the supplier to supply the circuit breaker in accordance with the Purchaser’s specification and the referenced standards. The specification should also state which standards should be applicable in the event of conflict in the standards requirements or in the event of conflict between the purchaser’s specification and the referenced standards.
The specification should identif’ the standards that must be followed by the supplier during the provision of the circuit breaker.
Users commonly follow the second approach, a set of companion documents, in the preparation of their specifications. This guide describes the second approach adopted by several users. However with a few modifications this specification can also be re-written as a single document specification for a specific circuit breaker order.
This guide includes several clauses that use the word “shall”. These clauses are included as typical sample clauses that may directly be used by the users in their specification. The other clauses with the word ‘should” are used to form the basis of a purchaser’s own worded clause for their specification.
5. General specification
A typical circuit breaker specification structure usually consists 01 thc following clauses. not necessarily in the same sequence or with the same title. These contain clauses that may be used directly in a purchaser’s specification. Alternately. they provide an example clause that may be used to lorin the basis of a purchaser’s own worded clause for their specification.IEEE C37.12 pdf free download.

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