[Linked Image]

[Linked Image]

[Linked Image]
Quote
Mike Holt has pointed out in his Grounding and Bonding text thousands of metal light poles are not grounded.

Here is an example I ran across recently in eastern Washington State.

The metal light poles (OK Luminaire Standards) are installed across a river bridge, the orginal poles were on the concrete railing. These poles are fed overhead at 120V or 240V, unfused from a transfromer via triplex to the first pole, and then open insulated conductors on insulators to the rest. There is no ground wire in the overhead feed. Also at one point there is a high voltage line (12,500 V) above the open street lighting feed.

Some one went to a lot of effort to install the secondary insulator rack. It would have been much faster (and code compliant) to use triplex. These type metal lighting poles are not designed for overhead feed.

- Tom Baker