SAFETY OF TRANSFORMERS, REACTORS, POWER SUPPLY UNITS AND COMBINATION THEREOF - PART 2-12: PARTICULAR REQUIREMENTS AND TESTS FOR CONSTANT VOLTAGE TRANSFORMERS AND POWER SUPPLY UNITS FOR CONSTANT VOLTAGE
International Electrotechnical Committee
FOREWORD
1 Scope
2 Normative references
3 Terms and definitions
4 General requirements
5 General notes on tests
6 Ratings
7 Classification
8 Marking and other information
9 Protection against electric shock
10 Change of input voltage setting
11 Output voltage and output current under
load
12 No-load output voltage
13 Short-circuit voltage
14 Heating
15 Short-circuit and overload protection
16 Mechanical strength
17 Protection against harmful ingress of dust,
solid objects and moisture
18 Insulation resistance and dielectric strength
and leakage current
19 Construction
20 Components
21 Internal wiring
22 Supply connection and other external flexible
cables or cords
23 Terminals for external conductors
24 Provision for protective earthing
25 Screws and connections
26 Creepage distances, clearances and distances
through insulation
27 Resistance to heat, fire and tracking
28 Resistance to rusting
Annexes
Annex C (normative) - Creepage distances (cr),
clearances (cl) and distances through
insulation (dti) - Material group II
(400 <= CTI < 600)
Annex D (normative) - Creepage distances (cr),
clearances (cl) and distances through
insulation (dti) - Material group I
(CTI >= 600)
Annex L (normative) - Routine tests (production
tests)
Annex R (normative) - Explanations of the application
of 4.1.1.2.1 of IEC 60664-1
Bibliography
Applies to stationary or portable, single-phase or polyphase, air-cooled (natural or forced), independent or associated dry-type: - constant voltage auto-transformers; - constant voltage separating transformers; - constant voltage isolating transformers; - constant voltage safety isolating transformers.
| Document Type | Standard |
| Status | Current |
| Publisher | International Electrotechnical Committee |
| Committee | TC 96 |
