[RFI] A `Time Bomb' Sits Atop Utility Poles

mike@rfiservices.com mike at rfiservices.com
Wed Sep 14 11:05:23 EDT 2005

The porcelain problem is caused by the expansion and contraction of the steel inside the porcelain. When it contracts their is a void between the steel and porcelain. When it expands the porcelain is forced by the steel to expand and can't.
This type of situation has exsisted for years when using aluminum/porcelain insulators. The problem is enhanced by the aluminum because aluminum is more suseptable to expansion and contraction.
Also, the polymer insulators are actually fiberglass inside. The polymer is the outer shell and is formed to increase the surface area and distance from end to end.

Mike Martin
RFI Services
6469 Old Solomon's Island Road
Tracy's Landing,MD 20779
mike at rfiservices.com
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