The Saint Paul globe. (St. Paul, Minn.) 1896-1905, 1901-08-30
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globe that it will be impossible for an!
sparks thrown off by the carbons t.
escape
"a. Insulating Joints
a. Must be entirely made o.
material that will resist the, &C
not give way or soften under the
heat of an ordinary gas flame or LEAK
under a moderate pressure. II Shall De
so arranged that deposit OF moisture
will not destroy the insulating effect, and
shall have an insulating resistance OF at
least $50 600 ohms between the gas pipe
attachments, and be suinclently sLrons
to resist the strain they Will be liable
to be subjected to in being installed.
90. Resistance Boxes and Equal
izers-
+ a. Must be equipped with metal or
with other non-combustible frames The
WORD frames in this section relates
TO the entire case and surroundings of
the rheostat, and not alone UNFOLDING
supports.
90. Reactive Coils and COndensOrs-
a. Reactive coils must be made of nom
combustible material, mounted on non
combustible bases and treated IN general
like sources of heat.
b. Condensers must be treated like ap-
paratus operating with equivalent volt
age and currents. They must have nom
combustioie cases and supports and must
be insulated from all combustible ma
terial and in general treated like sources
of heat
81. Transformers
a. Must not be placed in any but
metallic or other non-combustible cases
b. Must be constructed to comply with
the following test:
l. Shall be run for eight consecutive
hours at full load in watts under condf-
lions of service, and at the end OF That
time the rising temperature, as measured
by the increase of the distance of the
primary coil shall not exceed 1875 degrees
Fahrenheit.
,. The insulation of transformers when
heated shall withstand continuously for
five minutes a difference of potential
of 10000 volts alternating between prI-
mary and secondary coils and between
the primary coils and core, and a mo-
lead run" at double voltage for thirty
minutes.
IS. Lightning Arresters-
a. Must be mounted on nOn-combusti-
bic bases, and must be so constructed as
not to maintain an arc alter the dis
charge has passed, and must have no
moving parts.
80. Signaling Systems
Governing wiring for telephone, telc-
graph, district messenger and call bell
circuits; fire and burglar alarms, and all
other similar syStemS)
a. All aerial conductors and under
ground conductors which are directly
connected to aerial wires, must be pro-
Vided with some approved protective de-
vice, which shall be located as near their
point of entrance to the building as posi-
BILE not less than six inches from the
curtains or other inflammable material.
b. If the protector placed inside of
buildings wires from outside support to
binding posts of protector shall comply
with the following requirements:
l. Must be of copper, and not smaller
than No 16 B. & S. guage.
,. Must have an approved insulating
covering.
Immediately outside the building.
4. Must enter buildings through sepa-
rate holes slOping upward from the out
side, when practicable Holes to be bush
ed with nOn-absOrptive, Eon-combuStible
insulating tubes extending through their
entire length. Where tubing is not prac-
ticable the wires shall be wrapped with
two layers of insulating tape.
5. Must be supported on porcelain in
SUl2tOrS, so that they will not come in
contact with any other thar their des-
ignated supports.
g. a separation between wires of at
lest two and one-half inches must be
maintained
c. The ground wire OF the protective
device shall be run in accordance with
the following requirements:
l. Shall be of copper, and not smaller
than No. 16, B. & s.
?. Must be an approved rubber insulat-
Ing cOVoring.
3. Shall run in as straight a line as
possible to good, permanent ground.
4 Snail be kept at least three inches
from all other conductors and supported
on porcelain lnSulatOrS, so as not to come
in contact with anything but its designed
supports.
d. The protector to be approved must
comply with the following requirements:
i. Must be mounted on non-combusti-
bic non-absOrptive, insulating bases, so
designed that when the protector is in
place all parts which may be alive viii
be thoroughly insulated from the wall
holding the protector.
. Must have the following parts:
\ lightning arrcster which will operate
with difference of potential between
wires Of not over 800 volts, and so ar
ranged that the chance of accidental
grounding Is reduced to a minimum.
A fuse designed to open the circuit in
case the wires become crossed with light
o. power circuits and the fuse must be
able to open the circuit without arcine o.
or serious flashing when crossed with any
ordinary commercial light or power cir
exit.
3. The fuses must be so placed as to
PANtNoL IliS IL lCSlOl dilti heater COILS,
and the protector terminals must be
plainly marked Zine" instrument"
grounds.
e. Wires beyond the protector, EXCEPT
where punched, must be neatly arranged
and securely fastened in place in any con-
Nenlent Workmanlike manner. They must
not come nearer than six inches to any
electric light or power wire in the build
ing unless lncaSed III approved tubing SO
secured as to prevent its slipping out of
place.
Porcelain tubing or secular loom con-
oult ShaIl be used 70" encasing wires
I. Wires connected with outside civ
cults, where punched together within any
pulIdlng or inside wires, where laid IN
ccndults or ducts with electric light or
power wires, must have fire resisting
covers or else they must be enclosed in
IN alright tube or duct.
60. Electric Gas Lighting
" here electric gas lighting is to be used
on the same fixture with electric lights
a No part of the gas piping or fixture
shall be an electric connection with GAS
lighting circuit.
q. The wires used with the fixtrues
must have a nOn-infiammabIe Insulation,
or Where concealed between the nine and
smell OF the fixture, the insulating must
be such as required for fixture wiring for
electric light.
c. The whole installation must test free
from grounds"
d. The two installations must pass per-
fectly free from connection with each
other.
81. Insulation Resistance