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" handle. 4. Have carrying capacity sufficient to prevent heating above the surrounding atmosphere. 5. Be placed in dry accessible places, and be grouped as far as possible, being mounted, when practicable, upon slate or equally indestructible back boards. "
Electric Lighting Specifications for the Use of Engineers and Architects - Сторінка 130
автори: Earle Abbott Merrill - 1892 - 176 стор.
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Convention

National Electric Light Association. Convention - 1892
...secure contact, must make and break readily, and not stick when motion has once been imparted by the handle. 4. Have carrying capacity sufficient to prevent...upon slate or equally indestructible back boards. MOTORS. — In wiring for motive power, the same precautions must be taken as with the current of the...
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The Architect's and Builder's Pocket-book of Mensuration, Geometry ...

Frank Eugene Kidder - 1892 - 911 стор.
...ic-nparted by the handle. (d ) Must have carrying capacity sufficient to prevent heating. (e) Must be placed in dry, accessible places and be grouped as far as possible, being mounted—when practicable—upon slate or equally non combustible back boards. Jaek-krc-ife switches,...
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Electric Wiring for the Use of Architects, Underwriters, and the Owners of ...

Russell Robb - 1896 - 183 стор.
...been imparted by the handle. d. Must have carrying capacity sufficient to prevent heating. e. Must be placed in dry, accessible places, and be grouped...mounted — when practicable— upon slate or equally non-combustible back boards. Jack-knife switches, whether provided with friction or spring stops, must...
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The National Electrical Code: An Analysis and Explanation of the ...

Richard Henry Pierce - 1896 - 222 стор.
...once been imparted by the handle d. Must have carrying capacity sufficient to prevent heating. e. Must be placed in dry, accessible places, and be grouped as far as possible, being mounted—when practicable—upon slate or equally non-combustible back boards. Jackknife switches,...
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New Catechism of Electricity: A Practical Treatise

Nehemiah Hawkins - 1896 - 541 стор.
...been imparted by the handle. d. Must have carrying capacity sufficient to prevent heating. e. Must be placed in dry, accessible places, and be grouped as far as possible, being mounted—when practicable —upon slate or equally non-combustible back boards. Jackknife switches,...
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New Catechism of Electricity: A Practical Treatise

Nehemiah Hawkins - 1897 - 541 стор.
...been imparted by the handle. d. Must have carrying capacity sufficient to prevent heating. e. Must be placed in dry, accessible places, and be grouped as far as possible, being mounted—when practicable —upon slate or equally non-combustible back boards. Jackknife switches,...
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Transactions, Том 14

American Institute of Electrical Engineers - 1898
...point where the wires enter the building, and arranged to cut off the entire current. b. Must always be placed in dry, accessible places, and be grouped as far as possible. Knife switches must be so placed that gravity will tend to open rather than to close the switch. c....
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A textbook on electric lighting and railways: geometrical drawing ...

International Correspondence Schools - 1901
...point where the wires enter the building, and arranged to cut off the entire current. b. Must always be placed in dry, accessible places and be grouped as far as possible. Knife switches must be so placed that gravity will tend to open rather than close the switch. c. Must...
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A Textbook on Electric Lighting and Railways: International ..., Том 4

1901
...point where the wires enter the building, and arranged to cut off the entire current. b. Must always be placed in dry, accessible places and be grouped as far as possible. Knife switches must be so placed that gravity will tend to open rather than close the switch. c. Must...
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Electrical Engineer's Pocket-book: A Hand-book of Useful Data for ...

Horatic Alvah Foster - 1902 - 987 стор.
...and illuminated signs. 22. S» Heben — (See No. 77, and for construction Ao. 51.) b. Must always be placed in dry, accessible places, and be grouped as far as possible. Knife switches must be so placed that gravity will tend to open rather than close the switch. a. Must...
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