May Issue 2009


Article 210 Branch Circuits; Article 240 Overcurrent Protection; Article 250 Grounding and Bonding;


The good news is that the electrical current through low-voltage cabling—such as telecommunications, security...

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| May 2009
Next month at the NFPA Fire Safety Conference & Expo, the 2010 edition of NFPA 72 will be voted on by the National Fire Protection Association membership.

| May 2009
A few months ago, we answered a customer’s question about what equipment might be affected by a particular type of power quality phenomenon.

| May 2009
Duct detectors are installed through the wall of a duct in order to sense whether smoke is present in the air-circulation system.

| May 2009
One way electrical contractors (ECs) ensure safety is to install smoke alarms in every home they wire.