Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 179
O i w §^^ H « » 3w I ^1 < «o ^ w § O -K H 3 §^iJ <: UNDERWRITERS REQUIREMENTS 33 … COMMUTATOB Fig. 30. Rough Motor Commutator Increases Sparking and the safest arrangement. Motors operating at voltages over 550 volts require special precautions in re-spect to wiring leading to them. Motorsfor less than 550 volts are wired accord-ing to the general rules for low-poten-tial…
Electrical engineering
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