The Canadian Electrical Code Part I gives electrical utilities an exemption from the code for "installations and equipment in its exercise as a utility, located outdoors or in buildings or sections of buildings used for that purpose." The CEC Part I is "a voluntary code for adoption and enforcement by regulatory authorities." When adopted into the provincial regulations, this exemption is almost always maintained for work that falls within the scope of an electrical utility’s business.
The Canadian Electrical Code Part I gives electrical utilities an exemption from the code for "installations and equipment in its exercise as a utility, located outdoors or in buildings or sections of buildings used for that purpose." The CEC Part I is "a voluntary code for adoption and enforcement by regulatory authorities." When adopted into the provincial regulations, this exemption is almost always maintained for work that falls within the scope of an electrical utility’s business.
Over time, many electrical utilities have either developed their own design standards or use standards developed by others. Two CSA standards are often used as authoritative references for utility installations. These are CAN/CSA-C22.3 No. 1- M87 Overhead Systems and C22.3 No. 7-94 Underground Systems. In some instances, utility standards may meet or exceed electrical code requirements, or they may also fall short. One would hope that utility standards should satisfy minimum electrical safety requirements, especially for installations on private property.
In a brave new world of less regulation and greater competition, electrical utilities may want to take a closer look at their own design standards, to determine whether they should conform with the Canadian Electrical Code. In this article, we will look at some examples where the CEC Part III standards fail to meet the minimum safety requirements of the CEC Part I, and visit another issue that might affect electrical utilities as changes evolve.
Let’s begin by comparing some of the differences in high low and high voltage clearances. I will refer to the Canadian Electrical Code as CEC Part I and the CSA Part III overhead standards as CEC Part III. Both prescribe minimum horizontal and vertical clearances for a broad range of voltage classifications. As an aside, there are a few instances where the CEC Part I actually references CEC Part III when an installation strays beyond the parameters set out in the code. As a result, some paragraphs of CEC Part III actually become requirements of our electrical code.


