Overcurrent Protection and the NEC

The fundamental purpose of overcurrent protection is to protect conductors and equipment against the effects of excessive temperature on conductors and conductor insulation from...

Intrinsic Safety

Intrinsic safety is the method of protection for control and instrumentation circuits where the nominal voltage is 24 VDC or less and the current...

Feeder and Transformer Secondary Tap Conductors

Applying the rules of the 2002NECfor tap conductors is a topic that has generated many interesting code discussions on jobsites as well as at...

Area Classification for Class I Locations

Area classification, for locations where combustible materials (flammable gases or vapors, flammable liquids, or combustible liquids) are processed or handled, is the analysis of...

Supplementary Grounding Electrodes

Electrical systems and non-current-carrying metal parts of equipment in an electrical installation generally are required to be grounded; however, alternatives are given within the...

Understanding the Zone Area Classification Method in the NEC

The division classification method has been used in the United States since being incorporated into NEC 1920 to cover electrical and electronic equipment and...

Series Combination Rating Requirements

Series combination ratings are utilized to attempt to save money on some jobs. This article presents a simple checklist that can be completed by...

Canadian Electrical Code Revisions: Grounding and Bonding Requirements

The new 19th edition of the Canadian Electrical Code has brought about some changes in the grounding and bonding rules. Not many of these...

Installation of Intrinsically Safe and Nonincendive Systems

With technology rapidly advancing, new developments in sensing and process control have increased the number of products using intrinsically safe or nonincendive circuits as...

Dedicated Equipment Space

Provisions in the National Electrical Code covering dedicated space about electrical equipment have experienced a significant degree of modification through the last three Code...