Magnetic Fields (in mG) from Building Components
(Brief measurements of these fields were taken at one location and therefore do not account for all conditions that may exist.)
| Distance From Source (feet) | |||||
| source | 1' | 2' | 5' | 10' | 25' |
| Transformer (Dry Type) | |||||
| from high-voltage side | 33 | 16 | 5 | - | - |
| from low-voltage side | 53 | 23 | 6 | - | - |
| from top going up | 72 | 30 | 3 | - | - |
| 400-amp Feeder | |||||
| part load-balanced | 15 | 9 | 3 | 1 | - |
| (approx. 100 amps/phase with full return current on neutral conductor) |
A phase = 100 amps C phase = 115 amps B phase = 105 amps neutral = 13 amps | ||||
| full load-balanced | 55 | 34 | 9 | 3 | - |
| (approx. 350 amps/phase with full return current on neutral conductor) |
A phase = 360 amps C phase = 320 amps B phase = 333 amps neutral = 35 amps | ||||
| full load-unbalanced | 88 | 45 | 11 | 8 | 4 |
| (approx. 350 amps/phase with 50% return current on neutral conductor) |
A phase = 360 amps C phase = 320 amps B phase = 333 amps neutral = 17 amps | ||||
| Electrical Panel | |||||
| 200A full load-balanced | 373 | 148 | 27 | 7 | 1 |
| 600A full load-balanced | 2052 | 881 | 173 | 45 | 7 |
| 1200A full load-balanced | 6369 | 3478 | 579 | 142 | 22 |
| Motor | |||||
| 3-phase 8 HP | 12 | 2 | - | - | - |
| 1-phase 3 HP | 15 | 3.5 | 0.5 | - | - |
1515 Clay Street, Suite 1700 Oakland, CA 94612 |
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