BS 4999-111:1987
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
View Superseded by
General requirements for rotating electrical machines Specification for built-in thermal protection for electric motors rated at 660 volts a.c. and below
Hardcopy , PDF
09-02-2005
English
27-02-1987
Important note : All end users must be registered with an Account prior to user licenses being assigned.
Foreword
Committees responsible
Introduction
Specification
1 General
1.1 Scope
1.2 Definitions
2 Requirements for devices fitted into motor windings
2.1 General
2.2 Classification
2.3 Motors fitted with thermistors
2.4 Motors fitted with thermostats
3 Temperature sensitive resistors (thermistors)
3.1 General
3.2 Characteristics
3.3 Ability to withstand motor manufacturing processes
3.4 Dimensions
3.5 Leads
3.6 Marking
3.7 Type tests
3.8 Routine tests
4 Thermistor control unit
4.1 Terminals
4.2 Standard operating conditions
4.3 Drop-off (trip) and pick-up (re-set) resistance
4.4 Thermistor applied voltage
4.5 Abnormal conditions
4.6 Minimum voltage hold-in
4.7 Switching rating
4.8 Type tests
4.9 Routine tests
5 Thermostats
5.1 General
5.2 Characteristics
5.3 Ability to withstand motor manufacturing processes
5.4 Leads
5.5 Marking
5.6 Switching rating
5.7 Overload switching performance
5.8 Type tests on thermostats
Appendix
A Typical characteristic of PTC type thermistor
Tables
1 Winding temperature
2 Recommended reference temperatures for thermistors
Classifies types of protection, specifies winding temperatures for steady overload and stalled conditions. Recommends thermistor reference temperatures. Characteristics for thermostats, thermistors and thermistor control units with appropriate tests. Thermistors are of positive temperature coefficient. An appendix gives typical characteristic curve.
| Committee |
PEL/2
|
| DocumentType |
Standard
|
| Pages |
16
|
| PublisherName |
British Standards Institution
|
| Status |
Superseded
|
| SupersededBy | |
| Supersedes |
| BS 2501:1992 | Specification for commercial refrigerated storage cabinets of the closed reach-in type |
| DEFSTAN 02-632/2(2004) : 2004 | REQUIREMENTS FOR AC AND DC MOTORS |
| DEFSTAN 02-323/2(2001) : 2001 | REQUIREMENTS FOR CENTRIFUGES |
| BS 1608:1990 | Specification for electrically driven refrigerant condensing units |
| BS 5000-11(1973) : 1973 | SPECIFICATION FOR ROTATING ELECTRICAL MACHINES OF PARTICULAR TYPES OR FOR PARTICULAR APPLICATIONS - PART 11: SMALL-POWER ELECTRIC MOTORS AND GENERATORS |
| BS 5424-1:1977 | Specification for controlgear for voltages up to and including 1000 V a.c. and 1200 V d.c. Contactors |
Access your standards online with a subscription
Features
-
Simple online access to standards, technical information and regulations.
-
Critical updates of standards and customisable alerts and notifications.
-
Multi-user online standards collection: secure, flexible and cost effective.