Reclamation Manual: Design and construction, pt. 2. Engineering design: Design supplement no. 2: Treatise on dams; Design supplement no. 3: Canals and related structures; Design supplement no. 4: Power systems; Design supplement no. 5: Field installation procedures; Design supplement no. 7: Valves, gates, and steel conduits; Design supplement no. 8: Miscellaneous mechanical equipment and facilities; Design supplement no. 9: Buildings; Design supplement no. 10: Transmission structures; Design supplement no. 11: Railroads, highways, and camp facilities, Volume 10, Parts 1-2

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Page 5 - ... functions to allow only a specified number of operations of a given device, or equipment, or a specified number of successive operations within a given time of each other. It...
Page 4 - ... a machine and prevent its restarting if the control does not properly complete a predetermined sequence. (49) AC. Thermal Relay is a thermal device which functions when the temperature of ac. apparatus controlled tends to decrease below or increase above the safe operating value. (50) Short Circuit Selective Relay is one which functions on excessive rate of rise of current and may further allow reclosing only after normal conditions have been re-established. (51) AC.
Page 26 - TYPE ARE OF SAME SIZE UNLESS OTHERWISE SHOWN. 3. SYMBOLS APPLY BETWEEN ABRUPT CHANGES IN DIRECTION OF JOINT OR AS DIMENSIONED (EXCEPT WHERE ALL AROUND SYMBOL IS USED). 4. ALL WELDS ARE CONTINUOUS AND OF USER'S STANDARD PROPORTIONS, UNLESS OTHERWISE SHOWN.
Page 6 - ... circuit, or to switch a space heater in circuit, or to switch a light, or regenerative, load resistor of a power rectifier or other...
Page 7 - ... power circuit. (90) Voltage Regulator is a device which serves primarily to hold the voltage at a certain value or within certain limits. (91 ) Dc Voltage Directional Relay functions when the dc voltage exceeds a certain amount in a given direction. (92) Dc Voltage and Current Directional Relay is one used to give indication to close a circuit when the voltage exceeds a certain amount in a given direction, and to give the indication to open this circuit when the current exceeds a certain amount...
Page 5 - Reserved for future application. (57) Current Regulating Relay is one which functions to hold the value of current between given limits. (58) Voltage Regulating Relay is one which functions to hold the value of voltage between given limits. (59) Ac Overvoltage Relay is one which functions on a given value of ac overvoltage. (60) Voltage Balance Relay is one which indicates, or functions to hold, a given voltage difference between two sources of voltage. (61) Current Balance Relay is one which indicates,...
Page 3 - ... or load limiting resistors has been reached. (29) Isolating Circuit Breaker, Contactor or Switch is a device used for completely disconnecting one circuit from another, generally during emergency operation or test. (30) Annunciator Relay is a non-automatic-reset device which gives individual visual indications upon the functioning of lock-out protective devices, and may also be arranged to perform the lock-out function in the master control circuit. (31) Separate Excitation Device is one which...
Page 26 - In plan or elevation, near, far and both sides locations refer to nearest member parallel to plane of drawing and not to others farther behind. 2. In section or end views only, when weld is not drawn, the side to which arrow points is considered near side. 3. Welds on both sides are of same size unless otherwise shown. 4. Symbols govern to break in continuity of structure or to extent of hatching or dimension lines. 5.

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