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Rule 10-812 — Grounding Conductor Size

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...

Allowable Ampacities – Conductors in Cable Trays

In my experience, a discussion of conductor numbers and ampacities in cable trays is frequently met with a snicker or knowing smile. Could it...

Equipment Grounding Conductors for Parallel Conductor Installations

Equipment installed in electrical systems generally is required to be grounded. There are some specific exceptions that relax this general requirement of the NEC;...

Protection of Electrical Conductors: What, When and How

Canadian Electrical Code recognizes the fact that conductors used in any location must be protected against adverse effects of moisture, corrosive action, temperature and...

Current in the Grounded Conductor

Recently there have been several questions about the locations of grounding connections to the grounded conductor. Before looking at some of the requirements specific...

Single-Conductor Issues

In this article, let us review issues concerning induced current flow in the metallic coverings of single-conductor cables. Single-conductor cables have some advantages over...

The Effects of Ruling Span on Sag and Tension

Maximum Tension Since the National Electrical Safety Code (NESC) minimum vertical clearance between conductors at supports and between the conductors and ground are a function...

Rule 10-814 Bonding Conductor Size

Canadian Electrical Code, Rule 10-814 is where we find the minimum bonding conductor sizes for electrical circuits. It’s a fairly straight forward rule, simple...

Conductor Ampacity

The National Electrical Safety Code (NESC) only addresses conductor ampacity directly relative to grounding conductors. Rule 93C, page 19, requires grounding conductors to have...

Three Chiefs Come Full Circle on Parallel Paths and End on...

NEC AND FIELD PROBLEM Prior to the 1999 edition of the National Electrical Code, Section 250-24(a), Two or More Buildings or Structures Supplied from a...
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