 The switch must be so constructed that it shall be automatic in its action, not stopping between points when started, and prevent an arc between the points under all circumstances ; it must indicate on inspection whether the current be " on " or  Electrical Engineer - Сторінка 2001894Повний перегляд - Докладніше про цю книгу
 | 1913 - 242 стор.
...the building through an approved double-contact service switch, mounted in a non-combustible case, kept free from moisture, and easy of access to police or firemen. o. Must always be in plain sight, and never encased, except when required by the Inspection Department... | |
 | Terrell Croft - 1917 - 446 стор.
...leave the building through an approved double-contact service switch, mounted in a noncombustible case, kept free from moisture, and easy of access to police or firemen. To cut a series lighting device out of circuit, a shunt is arranged around the device. For example,... | |
 | Terrell Croft - 1920 - 488 стор.
...leave the building through an approved double-contact service switch, mounted in a noncombustible case, kept free from moisture, and easy of access to police or firemen. • To cut a series lighting device out of circuit, a shunt is arranged around the device. For example,... | |
 | Calvin Franklin Swingle - 1906 - 488 стор.
...through an approved double-contact service switch (see No. 51 b), mounted in a non-combustible case, kept free from moisture, and easy of access to police or firemen. FIGURE 147. In order that all of the wiring in the building may be entirely disconnected a switch,... | |
 | New York (N.Y.) - 1913 - 254 стор.
...the building through an approved double-contact service switch, mounted in a non-combustible case, kept free from moisture, and easy of access to police or firemen. o. Must always be in plain sight, and never •encased, except when required by the Inspection Department... | |
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