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Circuit loading requirements of Section 8 of the CE Code

Can single conductor free air cables be used for conductors terminating directly to distribution equipment? The simple answer is yes, BUT… This article will try...

Service-Entrance and Short-Circuit Currents

Service-entrance equipment can present unique challenges when it comes to proper application of electrical equipment. The service point is the point of demarcation between...

Troubleshooting Open-Circuit Faults in the Control Circuit

   Opening photo credit: lpmanagementservices.com Symptom The machine does not start when the start button is pressed. At this point the problem could be mechanical or electrical....

Calculating Short-Circuit Current

One of the most fundamental calculations made on a power distribution system is that which yields available short-circuit current. The September – October 2012...

Criteria for Selection of a Rating of Service, Feeder or Circuit...

Apparently, there is some confusion on this subject. Let’s tackle it step-by-step. Consumer’s service, a feeder and a branch circuit are defined by the Canadian...

Article 225 — Outside Brach Circuits and Feeders

Outside branch circuits and feeders — what is so special about these circuits that we require a completely separate article when they are located...

Standard Motor Control Circuits

Single-phase and three-phase AC squirrel cage induction motors need some type of circuit to initiate a start or stop function. Usually single-phase motors and...

NEC Requirements for Short-Circuit Current Ratings

Overcurrent protective device interrupting rating (IR) and equipment short-circuit current rating (SCCR) are key considerations for the safety of commercial and industrial electrical systems....

Article 220 — Branch-Circuit, Feeder, and Service Calculations

Article 220 is a cornerstone of theNational Electrical Codewhich gives us the information we need to properly size the circuits which will provide power...

How to Determine Short-Circuit Current Ratings

It’s important to understand short-circuit current ratings (SCCR) for industrial control panels. Industrial control panel is a general term that describes an assembly of two or...
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