Cyclopedia of Applied Electricity: Current measurements; Wiring; Telegraph

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American school of correspondence at Armour institute of technology, 1905
 

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Сторінка 198 - There should not be more than the equivalent of four quarter bends from outlet to outlet, the bends at...
Сторінка 191 - Must be so placed in wet places that an air space will be left between conductors and pipes in crossing, and the former must be run in such a way that they cannot come in contact with the pipe accidentally. Wires should be run over, rather than under, pipes upon which moisture is likely to gather or which, by leaking, might cause trouble on a circuit.
Сторінка 68 - If a circuit is made up of several different materials joined in series with each other, the resistance of the circuit is equal to the sum of the resistances of its several parts. In calculating the resistance of such a circuit, the resistance of each part should first be calculated, and the sum of these resistances will be the total resistance of the circuit.
Сторінка 78 - Ohm's law may therefore be expressed by the following equation: where / is the current in amperes, E the electromotive force in volts and R the resistance in ohms. It is therefore evident, that if the electromotive force and resistance are known the current may be found, or if any two of the three quantities are known the third may be found.
Сторінка 205 - This arrangement is made so that the cut-out or circuit breaker will protect all wiring in the building, and the opening of the switch will -disconnect all the wiring. These automatic cut-outs should not, however, be placed in the immediate vicinity of easily ignitible stuff...
Сторінка 201 - No combination fixture in which the conductors are concealed in a space less than one-fourth inch between the inside pipe and the outside casing, will be approved. h. Each fixture must be tested for "contacts...
Сторінка 204 - Must be placed on all service wires, either overhead or underground, as near as possible to the point where they enter the building and inside the walls, and arranged to cut off the entire current from the building. Where the switch required by rule No. 22 is inside the building, the cutout required by this section must be placed so as to protect it.
Сторінка 193 - Must be protected on side walls from mechanical injury by a substantial boxing, retaining an air space of one inch around the conductors, closed at the top (the wires passing through bushed holes) and extending not less than seven feet from the floor. When crossing floor timbers, in cellars, or in rooms where they might be exposed to injury, wires...
Сторінка 158 - ... between the ceiling and the board, in order to prevent fire from communicating from the switchboard to the floor or ceiling and also to prevent the forming of a partially concealed space very liable to be used for storage of rubbish and oily waste.
Сторінка 218 - All arc lamps should be provided with reliable stops to prevent carbons from falling out in case the clamps become loose, and all exposed parts should be carefully insulated from the circuit.

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