The Saint Paul globe. (St. Paul, Minn.) 1896-1905, 1901-08-30

DIdhch wires When turned off; must
&c so CONSTRUCTED that they shall be au-
tomato in action. not stopping between
points when started, and must prevent
an arc between the points under all cir
cumStanceS. They must Indicate under
inspection, whether the current be ON
or off"
"a. Cut-Outs and Circuit Break
4. Must be supported on the bases OF
non-combustible Don- absorptive insulat-
ing material.
b. Cut-outs must be provided with Gov
ers when not arranged in approved cab
inets, so as to obviate any danger of the
melted fuse metal coming in contact
with any substance which might be ig-
nited thereby.
c. Cut-outs must operate successfully
under the most severe conditions they
are liable to meet with IN practice. on
short circuits with fuses rated at fifty
per cent above, and with voltage TWEEN
ty-fve per cent above the current and
voltage for which they are designed.
d. Circuit breakers must operate sue
cessfully under the most severe condi-
tions they are liable to meet with in
| practice. on the short circuits when set
| at fifty per cent above the current and
with voltage twenty-five per cent above
that for which they are designed
e. Must be plainly marked, where 1t
will always be visible, with the name OF
the maker and current and voltage for
, which the device is designed.
4s. Fuses
a. Must have contact surfaces for tips
| of harder metal having perfect electrical
connections with the fusible part of the
| strip
b. Must be stamped with about eighty
per cent of the maximum current they
can carry indefinitely, thus allowing aDOIt
twenty-five per cent overload before fuse
melts.
c. Fuse terminals must be stamped
with the makers name. initials or some
known trademark.
40. Cut-Out Cabinets
a. Must be so constructed and cut
outs arranged as to obviate any can
ger of the melted fuse metal coming in
contact with any substance which might
be ignlted thereby.
l so. Sockets
Sockets of all kinds, including wall re-
! cepticles, must be constructed in accord
ance with the following specifications:
a. Standard Sizes: The standard lamp
: socket shall be suitable for use on any
: | voltage not exceeding go and with any
| size lamp up to fifty candle power For
lamps larger than fifty candle power Il
standard keyless socket may be used, or
| If a key is required, a special socket de-
| signed fer the current to be used must
be made. Any special sockets must fol-
low the general spirit Of these specifica-
! lions.
: b. Marking: Special large sockets
= | must be marked with the current and
: voltage for which they are designed.
|
be moderately hard, but not hard enough
to be brittle or so soft 10 be easily
denied or Knocked out of place Brass
shells must be at least 0.0l3 inch In
thickness. and shells of any other ma
= | tertal must be thick enough to give the
[ same stiffness and strength of brass.
= u. Lining: The inside of the shells
: must be lined with insulating material
! ! which shall absolutely prevent the shell
from becoming part OF the circuit even
though the wires inside the socket should
| nd limo
screws
2 The material used for lining must be
l al least one-thirty- second of an inch in
: ! thickness, and must be tough and tena-
ciouS 1t must not be injuriously affect
I'd by the heat from the largest lamp per
E mitted IN the socket, and must leave the
water in which IL is boiled practically
natural. 1t must be so firmly secured 20
the shell that ii will not fan out with
ordinary handling Of the socket IL Is
. preferable to have the lining in one
2 piece.
! c Caps: Caps when of sheet brass
! must be at least 0.0l3 inch in thickness.
! and when I'm cast or made of other
j metals, must be Of equivalent strength
The inlet piece, except for special sock
Gus, must he tapped and threaded for Or
binary V inch pipe. Ii must contain suf
= llelent metal for a full strong thread
e ana when not on the same piece as the
e CAP must be joined TO it in a way to c,y-r
Ihe strepStH -"T 4 single ,,lvcv. There
e aust be scincient room In the can tn on,
abie WIRE man to easily and quickly max,
u Knot In the cord, and push it into place
= u cap without crowdlnG. All parts Of
the cap which the knot is likely to bear
must be smooth ana we'll Insulated
f. Frame and Screws
. Ihe frame holding moving parts must
e be sufficiently heavy TO give arnUIs
> strength and stiffness
i Brass pieces containing screw threads
: must be at least 0.O6 Of an inch in thick
3 Binding post screws must not be small
wugfr
:, threads per inch.
3 &. Spacing:-
0 Points Of opposite polarity must every
= tourths Of inch apart. unless sepa-
: rated by reliable insulation.
h. Connections:
; The connecting points for the flexible
coId' must be made to very securely grip
No. lG H.. & 8. conductor A turned uD
rug arranged so that the cord NAV be
: gripped between the screw and the lug
I'D such way that IL cannot possibly
come out.
]. The socket must firmly hold the
r lamp IN place so that 1t cannot easily be
Jared out. and must provide a contact
} good enough to prevent undue heating
WIN maximum current allowed The
hoIdlng pieces and springs, if a part of
/ the circuit, must not be sufficiently ex-
posed to allow them to be brought in
and socket
j. The inside parts of the socket. which
are of insulating material, except the
lining. must be made of porcelain
X The socket key-handle must be of
such material that it will not soften
from the heat of a fifty candle power
/ lamp hanging downwards from the
! socket in air at seventy degrees Fahren-
heit, and must be securely attached to
{ the metal spindle 1t is designated to turn
l. All screws In porcelain pieces which
can be hrmIy sealed in place must be so
/ sealed by water proof compound which
will not melt below 200 degrees Fahren-
heit.
m. The socket must. as a whole be so
/ put together that it win not rattle 10
pieces.
n. The socket when slowly turned on.
times per minute. must make and
break the circuit 5000 times before fall
ing when carrying load Of one ampers
at 200 volts.
o. Keyless sockets of all kinds must
comply with the requirements for key
sockets as far as they apply.
p Sockets made Of porcelain or other
insulating material must conform 10 the
above requirements as far as they ap-
to Withstand a moderate amount Of harG
usage without breaking.
q. When the socket IS not attached to
fixtures the threatened inlet must be-
provided with a strong insulating BUSH
ing having a smooth mole of at least
/ fteen-sixty-fourths of an inch in thick
ness. The corners of the bushing must
so that in no place Will the cord be sub
jected to the cutting or wearing action
Of a sharp edge.
81. Hanger Boards
a Hanger hoards must no ca CON