Print Page   |   Contact Us   |   Sign In   |   Join
March-April 2009
Share |

March-April 2009 CoverMarch-April 2009


Stories are available to subscribers or members only. Join now

[Stories marked with a * may be viewed by nonmembers.]







The Challenge of Increasing Electrical Safety, Part 2

by Jim Pauley

Is an electrical inspection in your area viewed as a public safety activity that is respected without compromise? Are the inspection services offered in your area properly funded, or are they under scrutiny for budget cutting? Do the inspectors in your area meet a rigorous set of qualifications and continuing education requirements? Is an inspection viewed as necessary to ensure the benefits of public safety, or merely an "activity required by law”? Read more

Still on the Roof

* Unraveling the Mysterious 705.12(D) Load Side PV Connections

by John Wiles

In our top-to-bottom perspective of a PV system, we need to look at one more component usually located on the roof. This is the PV source-circuit combiner and it will be followed in the dc circuit by the PV dc disconnecting means. Read more

Inspecting to the Commercial Energy Code Provisions

by Pam Cole

Comprehensive sets of codes—electrical, energy, building, fire, plumbing, and mechanical—were developed to provide understandable requirements that are easily enforced. But codes only work if states and jurisdictions adopt them and designers and builders comply with them. Read more

Effect of Rooftop Exposure on Ambient Temperatures Inside Conduits

by Travis C. Lindsey

New requirements for ampacity correction factors for conductors installed in conduits on rooftops were introduced in the 2008 NEC at Section 310.15(B)(2)(c). This new requirement for ampacity correction due to ambient temperature resulted from extensive study and fact-finding efforts that collected data which demonstrated valid concerns about excessive heat exposure for conductors and cables installed on rooftops exposed to sunlight. These studies clearly warranted new requirements for ampacity correction factors for such installations. Read more

Wiring Methods – Making a Giant Safe

by Joe Riley

Excitement is building in Arlington, Texas, as the Dallas Cowboys’ new stadium nears completion. The city of Arlington, Texas, with a population of 350,000 is now the home of two major professional sports teams, the Texas Rangers and the Dallas Cowboys. The Rangers’ ballpark and the new Cowboys’ stadium are centrally located within Arlington’s thriving entertainment district, along with other attractions such as Six Flags Over Texas and Hurricane Harbor. Read more

CE Code, Section 12 Wiring Methods

by Steve Douglas

Between the 2006 and 2009 Canadian Electrical Code, Section 12 Wiring Methods has seen nine rule changes, and two appendix note changes. The intent of this article is to detail these changes along with rationale for the changes. Read more

Time to Sell…or Time to Buy?

by Jesse Abercrombie

We’re in a recession, which could be severe. Several financial services companies have either collapsed or been bailed out by the government. And the stock market is down about 45 percent since hitting its peak in October of 2007. Is this a "perfect storm” that should blow investors out of the market — or is it actually an opportunity for investors to jump back in? Most of my construction clients tell me that their business is their biggest gamble and they can’t afford to take as much risk outside of the businesses. So should you sell now to stop the bleeding or buy even more? Read more



Gloom, Despair, and Agony on Me

by James W. Carpenter

This was the opening line of the song by Buck Owens and Roy Clark on the TV show "Hee Haw.” It seems to fit in the today’s situation. With the TV newscasters and economic analysts constantly reporting on the sad state of affairs, both economic and military actions, it certainly causes us gloom, despair, and agony. Read more

Canadian Code

Section 32 – Fire Pumps

by Leslie Stoch

Fire pumps are a special motor drive application and are critical components of life safety systems in buildings. They are a requirement of the National Building Code of Canada and the provincial building codes. Fire pumps are used to maintain adequate water pressure in sprinklers and standpipes during a fire. The building codes specify when fire pumps are required. The Canadian Electrical Code, Section 32 specifies electrical equipment and wiring requirements. This article reviews the CEC requirements for fire pumps including wiring methods, disconnection means, overcurrent protection and transfer switching. Read more

Canadian Perspectives

Relationship between the CE Code and Z462

by Ark Tsisserev

Lately, the electrical industry in Canada has been buzzing about newly developed CSA standard Z462 which covers requirements for workplace electrical safety. Read more

UL Question Corner

Can Listed cable have dual ratings such as Type TC, 600V, direct burial cable that is also marked NPLF 150V?

by Underwriters Laboratories

The cable in question is dual rated as both, Type TC, Power and Control Cable (QPOR), page 275 in the 2008 UL White Book rated 600V and for direct burial and Non Power Limited Fire Alarm Cable (HNHT), located on page 144 in the White Book, NPLF cable rated 150V and marked appropriately. Read more

UL Question Corner

Does UL have special product categories for these types of LED lights?

by Underwriters Laboratories

Yes, UL is keeping pace with the changes in LED lighting technology and has developed many product categories to address the many types of LED luminaires and accessories. Read more

Recent Issues

March-April 2009January-February 2009November-December 2008September-October 2008July-August 2008

By Issue Date:
By Section