| 摘要 |
In an electrical distribution system in which the electrical conductors (11, 12) are enclosed within a length of hollow conduit (10) which is formed with a continuous slot (20) in one wall through which a plug (14) can in be inserted and rotated to bring its contact pins (77, 78) into contact with the conductors, gate means (32) are located within the conduit. The gate means have a normally closed position in which the conductors are closed off from that part of the conduit containing the slot, and these are movable into the open position by entry of the plug through the slot. In one embodiment a keyway (50) is provided in the conduit and the plug is formed with a corresponding projection which engages the keyway when the plug is fitted into the slot. The gate means is arranged such that it can only be opened by an element passing through the keyway, thus providing an additional safety feature. <IMAGE> |
