A Complete Manual on Practical Design and Layout of Electrical Systems for Power, Light, Heat, Signals, and ... In either case, the controlling device may be a simple manual, direct-acting device like a switch or circuit breaker or may be a ... than the entire circuit) is commonly accomplished with manual, direct-acting wiring device switches-mechanical or mercury type. ... to lighting fixtures, partitioning of the area of lighting coverage fed from -the panelboard, need for 3- or 4-way switchanbsp;...
|Title||:||Electrical Systems for Power and Light|
|Author||:||Joseph F. McPartland|