Consequences of Harmonizing Low Voltage (600, 1000 and 2000 V) Ratings in the Electrical Codes in North America

by Ravi GanatraCodes and StandardsFeaturesJuly/August 2016Listing and CertificationAugust 16, 2016March 24, 2018

Abstract National electrical codes provide the necessary recognition for products and stipulate the installation requirements for their applications to ensure…

How electricians test continuity of protective conductors

by Edvard CsanyiFeaturesListing and CertificationMay-June 2016Systems and EquipmentJuly 25, 2016March 24, 2018

For all protective conductors, including main and supplementary bonding conductors, electricians must perform a continuity test using a low-reading ohmmeter….

UL Question Corner: Are there “UL Authorized” Service People?

by Underwriters LaboratoriesListing and CertificationMay-June 2016UL Question CornerJuly 12, 2016March 24, 2018

Are there “UL Authorized Service People” who can modify UL Listed equipment in the field with no need of a…

UL Question Corner: Generator Enclosures

by Underwriters LaboratoriesJuly/August 2016Listing and CertificationUL Question CornerJuly 12, 2016March 28, 2018

I have a typical UL 2200 Listed generator installation set on a concrete pad. The generator has an overall enclosure,…

Medical Grade Strip Requirements, an Overview

by Kenneth BrownFeaturesListing and CertificationMay-June 2016July 11, 2016March 24, 2018

Due to the many safety standards that apply to medical grade power strips, identifying the correct set of standards for…

Ask the UL 3DP Expert

by Paul BatesFeaturesListing and CertificationMarch/April 2016June 14, 2016March 24, 2018

I am ready to buy a 3D printer for my home or company. Do I need to be concerned about…

UL Question Corner: New Understanding HazLoc App

by Underwriters LaboratoriesListing and CertificationMarch/April 2016UL Question CornerMay 31, 2016March 28, 2018

I rarely deal with hazardous location installations and find it difficult to grasp the concepts each time I have to…

Field Evaluations: An Inspector’s Point of View

by Scott HumphreyFeaturesListing and CertificationMarch/April 2016RenewablesMay 9, 2016March 24, 2018

I remember 20 plus years ago working as an electrician at several Boeing facilities in Seattle Washington, and having the…

An Approved Degree of Detail

by Nick SassoFeaturesListing and CertificationNovember/December 2015February 8, 2016March 24, 2018

I  AM FORTUNATE that I work for an AHJ that allows me to express myself so freely. I can write…

UL Question Corner — Self-testing GFCI Requirements

by Underwriters LaboratoriesListing and CertificationSeptember/October 2015UL Question CornerOctober 22, 2015March 24, 2018

Question I’ve heard GFCIs are now required to have a self-test feature. What is the new GFCIs self-test feature all…