Neutral grounding devices (resistors) are used to control the ground-fault currents and voltages to ground of alternating current systems. Earlier versions of the Canadian Electrical Code restricted the use of neutral grounding devices to systems that supplied only 3-phase loads (no single-phase loads). But the 2006 Canadian Electrical Code was revised to change all of that. Now single-phase loads are permissible with conditions.
(No Ratings Yet)Maximum circuit loading is a recurring theme in the Canadian Electrical Code. Some of the code requirements are not entirely obvious without some head scratching. This article reviews Rule 8-104, maximum circuit loading which happens to be one such rule.
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This article discusses issues that can come up when billboard signs are located too near overhead lines passing horizontal to or above the signs. Signs installed too near electrical and communication lines can create safety hazards for the owners of the signs, the sign installers, the sign maintainers and the owners of the lines who are most often electrical and communication utilities.
(No Ratings Yet)Rule 14-100 has requirements for reducing wire sizes connected to splitters, junction boxes and for control circuits such as pushbutton stations. The rule prescribes the minimum construction requirements for mechanical protection and maximum unprotected lengths of conductors so as to produce a safe installation. The rule is consistent in its overall requirements except for Sub-rule 100(d), which appears to be totally at odds with the remainder of the rule.
(No Ratings Yet)The Canadian Electrical Code defines a vault as “an isolated enclosure either above or below grade with fire-resisting walls, ceilings and floors for the purpose of housing transformers and other electrical equipment.” This article discusses the CEC requirements for electrical equipment vaults designed to house flammable liquid-filled equipment.
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This article reviews two very essential safety requirements of the Canadian Electrical Code for motor control circuits, grounding and why it’s so significant that control circuits be prohibited for use as motor disconnecting means.
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As we already know, the Canadian Electrical Code requires a minimum distance of 3 m between ground rods forming an electrical system grounding electrode. Why? This article discusses the reasons for this code requirement.
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Section 18 of the Canadian Electrical Code contains the rules for electrical equipment and wiring in locations where flammable vapours, gases or mists could create a fire or explosion, dusts capable of creating a fire or explosion or ignitable fibres are present.
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It’s Complicated — you’ve probably seen this witty movie about divorce. Motor wiring rules are complicated too, but not nearly as amusing as the movie. This article reviews our complicated rules for motor supply conductors. When wiring is installed directly into a motor terminal box, Rule 28-104 tells us that the minimum conductor insulation temperature [...]
(No Ratings Yet)Rule 10-812 specifies minimum grounding conductor sizes for low-voltage electrical systems up to 750 volts. This article discusses the complexities of this rule, which as you know, was revised in the 2009 Canadian Electrical Code.
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IAEI, as the keystone of the electrical industry, is a membership driven, non-profit association promoting electrical safety throughout the industry by providing premier education, certification of inspectors, advocacy, partnerships and expert leadership in Electrical Codes and Standards development.
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