84.7 F
Richardson, TX
Thursday, August 17, 2017

Monthly Archives: July 2010

Selective Coordination Enforcement: Overcurrent Protective Device Basics

The Basics of Selective Coordination Selective coordination is achieved when overcurrent protective devices are chosen such that whenever an overcurrent occurs only the nearest upstream...

Mechanical Answer to Stray Voltage

Tenants of the Time & Life Building in New York’s Rockefeller Center include Time Inc., publisher of more than 100 magazines. In an effort...

Air Conditioning… An Idea That’s Not as New As We Think!

Air conditioning is a twentieth century phenomenon. The Romans had aqueducts. The British discovered electricity. The Americans had an engineer whose invention to control...

Flex Your Network & Phone A Friend…Knowing Your Resources

It is impossible to know the answers to all of the questions we are faced with on a regular basis; each job site will...

Tables 11 and 19 in the CE Code — are they necessary guides to...

Let’s acknowledge a few undisputed facts: 1. All electrical equipment used in installations under provisions of the CE Code, Part I must be approved, and...

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...

Can Listed Water Heaters be Cord-and-Plug Connected?

Question Has UL Listed any cord-and-plug connected central air-conditioning units, central heating furnaces or storage tank water heaters?   Answer No, UL has not Listed cord-and-plug connected central...

Does UL apply a Listing Mark to a product based on evaluation to an...

Question: Does UL apply a Listing Mark to a product based on evaluation to an Outline of Investigation?   Answer Yes, in cases where a published UL Standard...

Answers and Section Meetings

In the fall of each year, IAEI members gather in each of the six sections to celebrate and to share the answers they’ve discovered....

The Difference between Success and Failure — How a Torque Wrench Improves System Reliability

In NASCAR, pit crew members use impact wrenches with preset torque values to install lug nuts during a wheel change. A loose lug nut...
- Advertisement -

MOST POPULAR

FLASHBACKS