[weesteev]

As long as it is signed and gaurded appropriatley then it should be ok (from a health and safety point of view). If its raining then its not very wise but for short periods of time then it will be ok. The chambers arent water tight so will have some water ingress at some time in thier lives, all connections (540/860 coax and copper) are shrink wrpped at the joints so water ingress shouldnt be an issue and the Telco BOM's are sealed (if its a SID area). Unless Noah's ark is required then rain shouldnt cause an issue to an open pit.