BS 587:1957

Co-operating organizations
Foreword
1 Scope
2 Definitions
3 Types of enclosure
4 Service conditions
4.1 Ambient temperature
4.2 Altitude
4.3 Atmosphere
5 Ratings, sizes and markings
5.1 Standard supply voltages
5.2 Standard a.c. supply frequency
5.3 Classes of mechanical duty for starters
5.4 Duty rating of switching starter models
5.5 Duty rating of auto-transformer starter models
5.6 Duty rating of rheostatic starter models
5.7 Duty rating of rheostatic controller models
5.8 Peak currents of rheostatic starters and
      controllers and associated resistors
5.9 Standard sizes of starters and controllers
5.10 Rotor currents and voltages
5.11 Marking
5.12 Terminal markings
6 Resistors for use with motor control gear
6.1 Duty rating of resistors for starters or
      controllers
6.2 Intermittent rating
6.3 Intermittent rating with creeping speeds
6.4 Limited continuous rating
6.5 Wholly continuous rating
6.6 Rating for general purpose resistors
7 Design and construction
7.1 Mounting
7.2 General construction
7.3 Construction of oil immersed models
7.4 Provision for earthing and earth continuity
7.5 Position of terminals
7.6 Terminals or sockets for external connections
7.7 Attachments of cable sheath or conduit
7.8 Joints
7.9 Renewable contacts
7.10 Motion of the handle or handles
7.11 Preferred standards for push-buttons
7.12 Preferred standards for indicating lamps
7.13 Return of moving contact to OFF position
7.14 Circuit interrupter for faceplate models
7.15 Undervoltage devices
7.16 Range of operation
7.17 Overload devices
7.18 Over-current capacity
7.19 Breaking capacity
7.20 Shunt field circuit
7.21 Auto-transformer tappings
7.22 Multiple-switch starter model
8 Limits of temperature rise
8.1 Contacts
8.2 Conductors
8.3 Coils in air
8.4 Coils in oil
8.5 Auto-transformer windings
8.6 Resistors
9 Tests
9.1 General
9.2 Type tests
9.3 Routine (individual) tests
9.4 Additional individual tests
Appendices
A Temperature measurements
B Clearances and creepage distances
C Information to be supplied to the manufacturer
      with enquiry or order
D Resistor ratings by classification numbers
E Maximum starting times for motor starters
F Duty cycles for resistors
G Switching starters for a.c. motors 1 to 25 h.p.

Hand operated and automatic types used with a.c. and d.c. motors of rated voltages up to 11 kV a.c. and 650 V d.c. Resistors, auto-transformers and similar associated equipment. Ratings, sizes, design and construction, temperature rise limits, type and routine tests, resistor duty ratings. Appendices on temperature measurement, clearance and creepage distances, resistor duty cycles, maximum starting times.