Appendix D Wiring Communications
D.3.1 Wiring Precautions
D-18
Fig. D.11 Laying Cables between Buildings
(a) Above-ground Structure (b) Under-ground Pit or Tunnel
(c) Burying in the Ground
60 cm min.
Trough
Communications
cable
bove-ground structure (steel frame)
Ground
Communications
cable
Low-voltage control circuit
Communications cable
General control circuit
Main circuit
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