Modern electrical construction; a reliable, practical guide for the beginner in electrical construction, showing the latest approved methods of installing work of all kinds according to the safety rules of the National board of fire underwriters (1905)
Horstmann, Henry C[harles], 1858- [from old catalog], Tousley, Victor Hugo, 1875- [from old catalog] joint author · Chicago, F. J. Drake & Co. · leaf 62
tro-magnet. In the Wurts non-arcing lightning arrester (Figure28) the discharge takes place across the air gaps between thecylinders; these are made of a metal which will not arc. A choke coil is essentially an electro-magnet, and like all TESTING 59 magnets offers a very high resistance to a… … Figure 27 b. Oily waste must be kept in approved metal cans andremoved daily. Approved waste cans shall be made of metal, with legsraising can 3 inches from the floor and with self-closingcovers. 7. Testing of Insulation Resistance. a. All circuits except such as are permanently groundedin…
Electrical engineering
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