| Year | 1930 |
| Date | 03-Apr |
| Volume | 62 |
| Issue | 1,508 |
| Page | 328 |
| Category | Electrical |
| Part | |
| Title | Modern Electrical Installation Work |
| Author | Frederick H.Taylor |
| Notes | Three-phase system, application of three-phase to lighting heating and power, voltage, distribution boards on three-phase, switches and their circuits, polarity of switches, general patterns, quick make and break actions |