|  | H |
SECTION H — ELECTRICITY

|  | H02 |
GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER

|  | H02B |
SWITCHBOARDS, SWITCHYARDS, OR SWITCHGEAR, FOR THE DISTRIBUTION OF ELECTRIC POWER (electro-technical elements or the individual mounting thereof, see the sub-classes for such elements, e.g. transformers Fulltext... Hierarchy... Expanded...H01F, switches, fuses Fulltext... Hierarchy... Expanded...H01H, line connectors Fulltext... Hierarchy... Expanded...H01R; interlocking between switches or between switches and gates, doors, shutters, or like movable parts of switchboards, switchyards, or switchgear Fulltext... Hierarchy... Expanded...H01H; installation of lines, cables, or other conductors for distribution Fulltext... Hierarchy... Expanded...H02G)

|  | H02B |
Note(s) This sub-class deals with switchboards, switchyards, switchgear, or the association of switching devices with each other or with other devices, g. transformers, fuses, meters, distribution boards, such associations constituting substations or distribution points.

|  | H02G |
INSTALLATION OF ELECTRIC CABLES OR LINES (distribution points incorporating switches Fulltext... Hierarchy... Expanded...H02B; cable ducts or mountings for telephone or telegraph exchange installations Fulltext... Hierarchy... Expanded...H04Q 1/06)

|  | H02G |
Note(s) This sub-class covers installation of communication cables or lines or of lightning conductors as well as installation of power cables or lines.

|  | H02H |
EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS (indicating or signalling undesired working conditions Fulltext... Hierarchy... Expanded...G01R, e.g. Fulltext... Hierarchy... Expanded...G01R 31/00, Fulltext... Hierarchy... Expanded...G08B; locating faults along lines Fulltext... Hierarchy... Expanded...G01R 31/08; emergency protective devices Fulltext... Hierarchy... Expanded...H01H)

|  | H02H |
Note(s) This sub-class deals only with circuit arrangements for the automatic protection of electric lines or electric machines or apparatus in the event of an undesired change from normal working conditions.

|  | H02J |
CIRCUIT ARRANGEMENTS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY (control of a prime-mover/generator combination Fulltext... Hierarchy... Expanded...H02P; interrelated control of several motors Fulltext... Hierarchy... Expanded...H02P; control of high-frequency power Fulltext... Hierarchy... Expanded...H03B; additional use of power line or power network for transmission of information Fulltext... Hierarchy... Expanded...H04B)

|  | H02J |
Note(s) This sub-class deals with ac or dc mains or distribution networks and also deals with circuit arrangements for battery supplies, including charging or control thereof, or co-ordinated supply from two or more sources of any kind. Control of a single motor, generator or converter of the types covered by sub-classes Fulltext... Hierarchy... Expanded...H01F, Fulltext... Hierarchy... Expanded...H02K, and Fulltext... Hierarchy... Expanded...H02M, is dealt with in sub-class Fulltext... Hierarchy... Expanded...H02P; control of a single motor or generator, of the types covered by sub-class Fulltext... Hierarchy... Expanded...H02N, is dealt with in that sub-class.

|  | H02K |
DYNAMO-ELECTRIC MACHINES (measuring instruments Fulltext... Hierarchy... Expanded...G01; dynamo-electric relays Fulltext... Hierarchy... Expanded...H01H 53/00; conversion of dc or ac input power into surge output power Fulltext... Hierarchy... Expanded...H02M 9/00; magneto-hydrodynamic machines Fulltext... Hierarchy... Expanded...H02N 4/00; microphones, pick-ups, telephone receivers, loud-speakers or other transmitters or receivers of sound or other mechanical waves Fulltext... Hierarchy... Expanded...H04R)

|  | H02K |
Note(s) Structural adaptation of the machine for the purposes of its control is in this sub-class, but controlling motors, generators, or converters, in general, is classified in sub-class Fulltext... Hierarchy... Expanded...H02P.

|  | H02M |
APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER (transformers Fulltext... Hierarchy... Expanded...H01F; dynamo-electric converters Fulltext... Hierarchy... Expanded...H02K 47/00; control of converters Fulltext... Hierarchy... Expanded...H02P; pulse generators Fulltext... Hierarchy... Expanded...H03K)

|  | H02M |
Note(s) This sub-class deals only with circuits or apparatus for the conversion of electric power. The electrotechnical elements employed are dealt with in the appropriate sub-classes, e.g. inductors, transformers Fulltext... Hierarchy... Expanded...H01F, capacitors, electrolytic rectifiers Fulltext... Hierarchy... Expanded...H01G, mercury rectifying or other discharge tubes Fulltext... Hierarchy... Expanded...H01J, semiconductor devices Fulltext... Hierarchy... Expanded...H01L, impedance networks or resonant circuits not primarily concerned with the transfer of electric power Fulltext... Hierarchy... Expanded...H03H.

|  | H02N |
ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR

|  | H02N |
Note(s) This sub-class deals with (a) electrostatic generators, motors, clutches, or holding devices, (b) other non-dynamo-electric generators or motors, and (c) arrangements for starting, regulating, braking, or otherwise controlling such machines unless in conjoint operation with a second machine. Specific provision exists for generators, motors, and other means for converting between electric and other forms of energy, e.g. in sub-classes Fulltext... Hierarchy... Expanded...H01L, Fulltext... Hierarchy... Expanded...H01M, Fulltext... Hierarchy... Expanded...H02K, Fulltext... Hierarchy... Expanded...H04R.

|  | H02P |
CONTROLLING ELECTRIC MOTORS, GENERATORS, OR CONVERTERS (structure of the starter, brake, or other control devices, see the appropriate sub-class, e.g. mechanical brake Fulltext... Hierarchy... Expanded...F16D, mechanical speed regulator Fulltext... Hierarchy... Expanded...G05D, variable resistor Fulltext... Hierarchy... Expanded...H01C, starter switch Fulltext... Hierarchy... Expanded...H01H; arrangements structurally associated with motors, generators, or converters, see the relevant sub-classes for the motors, generators, or converters; connection or control of one generator, transformer, or converter with regard to conjoint operation with a similar or other source of supply Fulltext... Hierarchy... Expanded...H02J)

|  | H02P |
Note(s) This sub-class deals with arrangements for starting, regulating, braking, or otherwise controlling motors, generators, converters, clutches, brakes, or gears, of the types classified in sub-classes Fulltext... Hierarchy... Expanded...H01F, Fulltext... Hierarchy... Expanded...H02K, and Fulltext... Hierarchy... Expanded...H02M. Similar arrangements for the apparatus of the types classified in sub-class Fulltext... Hierarchy... Expanded...H02N are dealt with in that sub-class.