Page 127 - Pipeline Rules of Thumb Handbook

4: Electrical Design

Electrical design.................................................................................. 115
Hazardous locations ............................................................................ 116
NEMA Enclosure Types..................................................................... 117
Size portable electric generators........................................................ 118
Typical wattages for tools and appliances.......................................... 119
Knockout dimensions.......................................................................... 119
National Electrical Code Tables ........................................................ 120
Electrical formulas.............................................................................. 124
Full load currents—single phase transformers ................................. 124
Full load currents—three phase transformers .................................. 125
Motor controller sizes......................................................................... 125
Voltage drop on circuits using 600V. copper conductors in steel
conduit ............................................................................................. 126
Determine the most economical size for electric power
conductors ....................................................................................... 126
How to find the resistance and weight of copper wires................... 127
What you should remember about electrical formulas .................... 127
How to calculate microwave hops on level ground .......................... 127
For quick determination of the horsepower per ampere for
induction motors (3 phase) at different voltages .......................... 128
Chart gives electric motor horsepower for pumping units .............. 128
Pumping stations................................................................................. 129
Floodlighting Concepts.........................................130
Terms ................................................................................................... 130
Floodlighting calculations................................................................... 130
Point-by-point method........................................................................ 130
Beam-lumen method .......................................................................... 131
Design procedure................................................................................ 131
Conductor size conversion chart—Metric to AWG.......................... 132

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