 | National Electric Light Association. Convention - 1892 - 458 стор.
...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... | |
 | Frank Eugene Kidder - 1892 - 1058 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,... | |
 | Russell Robb - 1896 - 208 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... | |
 | Richard Henry Pierce - 1896 - 234 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,... | |
 | Nehemiah Hawkins - 1896 - 568 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,... | |
 | Nehemiah Hawkins - 1897 - 574 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,... | |
 | American Institute of Electrical Engineers - 1898 - 716 стор.
...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.... | |
 | 1901 - 618 стор.
...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... | |
 | International Correspondence Schools - 1901 - 630 стор.
...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... | |
 | Horatio Alvah Foster - 1902 - 1986 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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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. 
