These specifications are intended as a reference for purchasers and users of circuit breakers in the preparation of requests for quotations and as a reference for manufacturers and vendors in submitting bids. 12-1.2 These specifications apply to all types of alternating- current power circuit breakers (indoor and outdoor) having an interrupting rating of 50 mva or higher and a voltage rating above 1500 volts. Individual clauses apply to all types except where otherwise indicated. 12-1.3 These requirements of necessity include some elements of construction and materials, but are not intended to preclude ingenuity of design or improvement.
- Status
- Superseded Standard
- Board Approval
- 1952-08-21
- History
-
- Published:
- 1951-11-30
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