Зображення сторінки
PDF
ePub

matic, 101; covered, 75, 130; double-
pole, 76; fusible, 75; plug, 130;
(service switch), 90.
Cut-outs, rules for double-pole safety,
127.

D.

Decorative series lamps, rules for,

152.

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.

E.

Each side of circuit, 69.

Earth, 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,

10.

Equalizer, 61.

F.

Feeders, 163.

Filled, 57.

closet, 128; length of, 130, 134;
link, 133; on branches, 129.
Fuses, rules for safety, 132.

G.

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.

H.

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.

I.

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.

118.

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.

J.

Jack-knife switch, 138.

Joint, insulating, 141.

Joint, twisted, 84.

Junction-box, 124.

K.

Keyless sockets, 147.

Key sockets, 147.

Knot in flexible cord, 152.

L.

Lamp, arc, 96; incandescent, 17.

Lamps, and other devices, rules for

arc,

[blocks in formation]

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.

M.

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.

R.

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.

[blocks in formation]

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-

ers. -

a,

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.

-

a, 16.

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

18.

10. Outside Conductors. a, insu- 17.
lating covering, supports, 79;
b, position, distance apart, 81;
c, distance above roofs, 81; d,

[blocks in formation]

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-

[blocks in formation]

40. Car Wiring, 163.

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-

LANEOUS.

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.

-

S.

Safety-catch, 133.
Safety-fuses, rules for, 132.
Sealed fixtures, 143.
Secondary batteries, 169.
Secondary coil, 155.

Snap-switch, 89.

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.

T.

Table of capacity of wires, 135, 136.

Secondary conductors, rules for, 160. Tape, 89.

« НазадПродовжити »