| Year | 1930 |
| Date | 20-Mar |
| Volume | 62 |
| Issue | 1,506 |
| Page | 273 |
| Category | Electrical |
| Part | |
| Title | Modern Electrical Installation Work |
| Author | Frederick H.Taylor |
| Notes | Heating and power services (two wire), three-wire system of supply (D.C.), employment of a three-wire system, distribution boards on a three-wire system, power circuits from a three-wire system, summary of points (three-wire system) |