matic, 101; covered, 75, 130; double- pole, 76; fusible, 75; plug, 130; (service switch), 90. Cut-outs, rules for double-pole safety, 127.
Decorative series lamps, rules for,
Detecting or indicating devices, 73. Direct current, 157.
Distribution, systems of, 28. Double-pole, 76; safety cut-outs, rules for, 127. Double contact, 92. Drip-loops, 88. Drip-pans, 78. Drop, 22.
Dynamo, 57; rooms, rules for, 56; rooms, rules for conductors in, 60.
Each side of circuit, 69.
Electrical pressure, 9, 57. Electrical units, the, 9, 10.
Electric gas-lighting, rules for, 146. Electric railways, rules for, 160. Electrolysis, 167.
Electro-magnetic devices, 102. Electro-motive force, 9, 57; unit of,
closet, 128; length of, 130, 134; link, 133; on branches, 129. Fuses, rules for safety, 132.
Gas-lighting, rules for electric, 146. Gauges, 69, 111. Generator, 57.
Generators, rules for, 56. Globes, vapour-tight, 148.
Globes, wire netting around arc- Ground return wires, 163. lamp, 97. Grounds, 59, 117. Guard-irons, 82.
Hand spring-switch for series incan- descent lamps, 101. Hand-switch, arc lamp, 96. Hanger-board, arc lamp, 90, 98; for series incandescent lamps, 101. Heating effect of current, 13-18. High efficiency, incandescent lamps of, 26.
High potential, 57; systems, rules for, 79; systems, rules for interior conductors of, 86; systems, rules for outside conductors of, 79. Hydraulic analogue, of multiple cir- cuit, 36; of series circuit, 29.
Incandescent lamp, 17.
Incandescent lamps, in series cir- cuits, rules for, 101; of high efficiency, 26.
Fished on the loop system, wires, Indicating devices, detecting and, 73.
Fixture, burrs and fins, 143; casing, 144; combination, 131; ceiling- block, 144; insulating-joint, 141; sealed, 143; shells, 143; wires, 143; work, rules for, 139. Flexible cord, rules for, 148. Fusible cut-out, 75.
Induced currents, 155. Induction, 154.
Inside wiring of low-potential sys- tems, rules for, 108. Insulating bushing for sockets, 151. Insulating-joint for fixtures, 141. Insulating-tubes, 62, 89, 112. Insulation, general nature of, 5.
Fuse, 48, 75, 130-135; block, 76; Insulators, 61, 62.
Interior conductors of high-potential | Motors, rules for, 74.
systems, rules for, 86.
Interior conduit, rules for, 122. Iron-armoured conduit, 127.
Isolated plants, rules for, 56.
Jack-knife switch, 138.
Joint, insulating, 141.
Joint, twisted, 84.
Junction-box, 124.
Keyless sockets, 147.
Key sockets, 147.
Knot in flexible cord, 152.
Lamp, arc, 96; incandescent, 17.
Lamps, and other devices, rules for
Path of least resistance, current choosing, 38.
95; of high efficiency, incan-Plated and plain carbons for arc descent, 26.
Leakage, arcs from, 48; through
base frames, 58; troubles from, 6, 58, 117.
Length of fuse, 130, 134.
Light and power from trolley wires, 164; rules for, 163. Lightning, arrester, 68; arresters, rules for, 67; discharges, 70. List of approved wire, 80. Loop system, wires fished on the, 118. Loss of pressure in conductors, 13-19. Low potential, 57; interior con- ductors, rules for, 109; inside wiring, rules for, 108; outside conductors, rules for, 104; service- switch, 109; underground conduc- tors, rules for, 105.
Make and break, 138. Materials, note in rules on, 174. Methods of wiring, 46. Miscellaneous rules, 170.
Motor, 57; case, 78; resistance-boxes, 75, 79; service-switch, 93.
lamp, 98.
Plug cut-out, 130.
Polarity, opposite, 115. Potential, 57.
Power-stations, rules for street-rail- way, 160. Power-wires, 82.
Pressure, electrical, 9, 57; in con- ductors, loss of, 13-19; of series circuit, 31; unit of, 10. Primary batteries, 168; rules for storage or, 168.
Primary conductors, rules for, 159. Primary coil, 155.
Proportioning of wires, 13. Protectors, rules for wire, 171, 172.
Railway return circuit, 166. Railways, rules for electric, 160. Rate of work, 32.
Resistance, 8, 10, 12, 13, 20; box, 61, 66; boxes and equalizers, rules for, 66; boxes, rules for motor, 75; unit of, 10.
Resistances, arc lamp, 145.
guard-irons, 81; e, insulators, 82; f, joints, 82; g, not on same cross-arm with wires in battery circuits, 83. (List of approved wires for meeting requirements of rules 10 (a), 12 (d), and 18 (a), 80.) Service-blocks, 83. Interior Conductors.-
a, service entrances, 86; b, service- switch, 86; c, in plain sight, 87; d, insulating covering, 87; e, distance apart, insulators, 87; f, through floors, walls, etc., 87; g, joints, 87. Arc Lamps. —a, isolated from inflammable material, 95; b, globes, 95; c, hand-switch, au- tomatic switch, 95; d, stops, 95; e, insulation from circuit, 95; f, wire netting around globes, spark-arresters, 95; g, hanger-boards, 96; h, without hanger-boards, 96.
5. Resistance-boxes and Equaliz- 14. Incandescent Lamps in High-
non-combustible
frames, 66; b, location, 66.
6. Lightning-arresters. -a, where required, 67; b, mounting, 67; c, earth connections, 67; d, construction, 68.
7. Testing.-a, high-potential cir- cuits, 71; b, low-potential cir- cuits, 71; c, records, 71.
8. Motors. -a, wiring and appli- ances, 74; b, insulation from 15. ground, 74; c, waterproof cover and case, 74.
9. Motor Resistance-boxes.
non-combustible frames, 75; b, location, 75.
CLASS B.-HIGH-POTENTIAL SYS-
TEMS (OVER 300 VOLTS).
potential Series Circuits.-a, general rules, switches, 101; b, suspension, 101; c, electro- magnetic devices, multiple-se- ries and series-multiple cir- cuits, 101; d, on gas-fixtures, 101.
CLASS C.- LOW-POTENTIAL SYSTEMS (300 VOLTS OR LESS). Outside Overhead Conductors. -a, general rules, 104; b, dis- tance apart, main cut-out, 104. Underground Conductors. a, service entrance, 105; b, ser- vice-switch, cut-out, 105; c, shunting round catch-box, 106. Inside Wiring. - General Rules. Service-Switch, 108. Conductors. a, size and insu- lating covering, 109; b, through floors, walls, etc., 111; c, when
10. Outside Conductors. a, insu- 17. lating covering, supports, 79; b, position, distance apart, 81; c, distance above roofs, 81; d,
Inside Wiring. - Special Rules. 19. Wiring not in Moulding or Ap- proved Conduit.—a, insula- tors, 114; b, distance between 27. wires, 114; c, distance between wires for higher voltage, 114; d, plaster, cement, etc., 114; e, staples, 114. In Concealed Places and Lofts. -f, air- space around wires, 117; g, distance between wires, 117; h, under roofs, near water- pipes, etc., 118; i, fished on loop 28. system, 118; j, fished wires, 118; k, twin wires, 118. 20. Mouldings. -a, where not to be used, 120; b, moisture proof, 29. 120; c, construction, 120. 21. Special Wiring; places liable to
moisture, acid, or corroding fumes. -a, distance between 30. wires, 121; b, insulating cov- ering, 121; c, carefully put up, 121; d, insulators, switches, 31. cut-outs, 121; e, through floors, walls, etc., 122. 22. Interior Conduits.-
of harder metal, 132; c, pro- portions, 132.
Table of Capacity of Wires, 135, 136.
Switches. -a, material, 137; b, double-pole, 137; c, construc- tion, 137; d, carrying capacity, 137; e, where and how placed, 137.
Fixture Work. - a, insulating-
joints, 139; b, supply-conduc- tors, 139; c, when wiring is outside, 139; d, conductors, size and covering, 140; e, burrs and fins, 140; f, to be sealed, 140; g, space for wires, 140; h, testing, 140; i, ceiling- blocks, 140.
Arc Lights on Low-potential Circuits. -a, size wire, 144; b, cut-outs, 144; c, resistances, 144; d, globes, etc., 144. Electric Gas-lighting. -a, in- sulated from pipes, 146; b, insulating covering on wires, 146; c, d, testing, 146. Sockets. -a, outside insulated from conductors, 147; b, va- pour-tight globes, 147. Flexible Cord.-a, how made, 148; b, may sustain one lamp, 149; c, limited use, 149; d, not in show windows, 149; e, insu- lating bushings in sockets, 149; f, knots in sockets and in rosettes, 149; g, equipped with keyless sockets, 149. Decorative Series Lamps, 152.
CLASS D.- ALTERNATING SYSTEMS. CONVERTERS OR TRANSFORMERS.
a, must be continuous, material, 123; b, material, 123; c, installation, 123; d, location, 123; e, con- ductors, 123; f, closed ends, joints, 123; g, extension be- 32. yond walls, 123. (List of approved conduit, 122, 123.) 23. Double-pole Safety Cut-outs. - a, location, 127; b, branch cut- 33. outs, 127; c, material, 127; d, construction, 127; e, combina- tion fixtures, 128; f, stamped 34. with carrying capacity, 128. 35. 24. Safety-fuses. —a, stamped with carrying capacity, 132; b, tips
Converters. a, location, 153; b, non-combustible cases, 153; c, insulated from walls, 153. Converters inside Buildings, 153. Primary Conductors. -a, insu- lating covering and protec- tion, 159; b, service-switch
and main cut-out, 159; c, dis- | Series circuits, rules for incandes-
cent lamps on, 101.
Series lamps, rules for decorative,152. Series-multiple system, 103.
Series system, 28-35; hydraulic ana- logue of, 29; pressure on, 31; multiple, 102.
Service, blocks, 84; blocks, rules for, 83; switch, arc, 89, 90; switch, low-potential, 109; switch, motor, 93; wires, 80. Shells, fixture, 143. Short circuit, 31, 37.
Shunt, 38, 107, 173. Single-pole, 76.
41. Lighting and Power from Rail- Skeleton form, switch-board in, 65.
way Wires, 163.
42. Car-houses, 163.
43. Ground Return Wires, 163.
CLASS F.-BATTERIES.—MISCEL-
44. Storage or Primary Batteries. -a, general rules, 168; b, in- sulators for storage batteries, 168; c, acid fumes, 168; d, corrosion, 168.
45. Miscellaneous. -a, testing, in- sulation resistance, 170; b, ground wires on gas-pipes, 171; c, wires in battery cir- cuits in ducts, 171; d, protec- tive devices for wires in bat- tery circuits, 171; wire protec- tors, 172; e, soldering-fluid, 174. Materials. Non-combustible, non-absorptive, insulating ma- terials, 174; list of approved wires, 80.
Safety-catch, 133. Safety-fuses, rules for, 132. Sealed fixtures, 143. Secondary batteries, 169. Secondary coil, 155.
Sockets, rules for, 147; key, 147; keyless, 147; insulating bushing for, 151.
Soldering-fluid, note in rules on, 174. Spark-arresters, arc-lamp, 98. Special wiring, rules for, 121. Staples, 117.
Stations, rules for central, 56. Stops, arc lamp, 97. Storage batteries, 169. Storage or primary batteries, rules for, 168.
Supply-conductors, fixture, 143. Switch, 77; arc lamp, automatic, 96; arc lamp, hand, 96; jack-knife, 138; arc service, 89, 90; low-po- tential service, 109; motor ser- vice, 93; snap, 89. Switch-boards, 61, 65; rules for, 64. Switches, rules, for, 137. System, closet, 41; multiple, 36;
multiple-series, 102; series, 28-35; series-multiple, 103; three-wire, 42. Systems, of distribution, 28; rules for alternating, 153; rules for high- potential, 79; rules for low-poten- tial, 104.
Table of capacity of wires, 135, 136.
Secondary conductors, rules for, 160. Tape, 89.
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