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at the website of the Bruderheim REA since March 27, 2002

Power-Line Work: Main Page
Brushing and tree-trimming
Pole-testing and Pole-changes
Modifying guy-wires

Excerpt from Safety Codes: Tree-Trimming

 

Line Work — Tree-trimming or brushing

2004 09 01

Index:

The pages at the website of the Safety Codes Council state: "Putting the Safety of Alberta Communities First".  Maybe so, but one gains the impression from visiting their website that what comes before the safety of Alberta communities is money.

The Alberta Electrical and Communication Utility Code (hereafter called the Code) can be provided by them, apparently only in hard-copy form, although the latest revised index to the Code is accessible at the website.  But the Code itself cannot be had without a price.

Consider that it was not all that long ago that such publications were provided for the asking.  That was when Alberta seniors received grants and subsidies — such as the moneys available under the Winter-Works Program – and not claw-backs.

Nevertheless, the Code states:

[Note: You must refer to the official version of the Code to be sure to have the latest information at hand.  The following quote will not necessarily be kept up-to-date as time passes.]

3.1.7 Tree trimming

(1)    Subject to subsection (2), the operator of an electrical utility system shall ensure that trees near overhead power lines are trimmed so that the following minimum clearances are maintained at all times, including the period between tree trims:

  1. a vertical clearance of 2.0 m plus the minimum distance to prevent flashover, from the conductors to any portion of a tree that will support a person; and
  2. a vertical clearance of 600 mm plus the minimum distance to prevent flashover, from the conductors to any portion of a tree that will [not] support a person; and
  3. a horizontal clearance of 1.0 m plus the minimum distance to prevent flashover, from the conductors to any portion of a tree that will support a person; and
  4. a horizontal clearance of 300 mm plus the minimum distance to prevent flashover, from the conductors to any portion of a tree that will not support a person.
  (2)    [Subsection (2) was not shown in the copy of page 49 of the code that I received, although it is ostensibly a Xerox copy of the latest version of the Code. —WHS]
  (3)    For overhead power or communication lines with metal sheathed, insulated or polyethylene covered conductors, operated at voltages below 750 V between conductors, the minimum clearance between the conductors shall be up to but not touching.
  (4)    Where trimming is impracticable, the conductors shall be protected as necessary to prevent damage and electrical hazards.
(3)     Amend 3.2.3.2. by adding the following:
(3.2.3     Protection Against Climbing – 3.2.3.2 Other Location)
  (1)    Poles or structures of electrical utility system lines shall not have equipment located on the pole or structure:
 
  1. for a minimum distance of 2.5 m above grade level; or
  2. for a minimum distance of 2.5 m above equipment where equipment is located on the pole or structure within 2.5 m of grade level.
  (2)    Subsection (1) does not apply to ground conductors, electrical communication cables, conduits, riserways, fasteners or gang-operated switch operating handles.

Let's be realistic, aside from the errors in grammar and punctuation that I faithfully reproduced in the preceding quote, the instructions are clear, and their meaning and purpose is unmistakable:  electrical service installations that don't adhere to those requirements are potential killers of friends and family members.


__________________
Posted 2004 09 01
Updates:
2005 12 05 (inserted the word "not" in section 3.1.7 žb of the tree-trimming specifications)