In 1995, CL&P Arborist and then CTPA Executive Secretary (and now Past President!) Alan Carey put together a very useful Booklet entitled "Plain Language Guide - OSHA 1910-269".  This very useful publication covers safety as it relates to line-clearance tree trimming operations in the vicinity of power lines.  It is still used in Arboriculture 101 and other Electrical Hazard Awareness courses.  

Alan has put together a presentation in power point that covers the essential points in that booklet.  If you wish to view this presentation, just click on the following link:

OSHA 1910.269 - Line-Clearance Tree Trimming Operations

(Please note - this presentation is based in power point and may require an update to your browser in order to view the included graphics).