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Monthly Archives: March 2010

The Microinverter and the AC PV Module

No discussion of PV systems would be complete without a look at the newest inverter technologies that the installer and inspector will face. These...

Are We Really Ungrounded?

If you were to open an unopened jar, does that jar still qualify as "unopened”? No one would argue the fact that the moment...

When is a sign not just a sign?

Today’s demand for attention has brought on the need for signs to be more than just a display. Theses signs are designed for the...

Standby and emergency power supply. Is there a difference?

Let say, a designer decides to install a backup power supply for the IT network in the office, or to provide an alternate source...

Safely Harnessing the Sun’s Energy

Across the country and around the world, harnessing energy from the sun is becoming increasingly achievable for homeowners, businesses, and utilities alike. With an...

The Evolution of Communications Circuits & the NEC

In the beginning Samuel Morse, in 1844, started the digital data communications industry with a 37-mile stretch of wire sending what became known as...

The Importance of the AHJ in Fire Pump Installations

The services of the inspection community are of utmost importance to maximize safety and reliability. This is especially true when the inspector serves as...

GFCIs – Where are they?

The 2009 Canadian Electrical Code is peppered with references to, and requirements for ground-fault circuit interrupters (GFCIs). For very good reasons, GFCIs have become...

Stray Voltage — Catching What We Cannot See

"Where the cow won’t give milk anymore” is a standard lyric in old classic country songs; perhaps you’ve wondered why. Well, back in the...

Circuit breakers and old panelboard; will anything work?

Question I have an old panelboard made by a company that was sold and no longer produces panelboards or circuit breakers under their old name....
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