Ask the Experts

Those Pesky In-Between Harmonics

They can overheat your system and make your fluorescent lights flicker, and they're often caused by the instruments you need to improve power quality. Interharmonics are those odd frequencies that lurk between the fundamental and its typical multiples, and they'll make you yearn for the simpler problems of run-of-the-mill harmonics. Between stops on EC&M's Code Change Conference tour, Editorial Director

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Electrical Construction and Maintenance

Arlington TV Bridge

Arlington's TV Bridge includes two recessed power/low voltage combo boxes and all the connections you need (except for the NM cable) to install a flat screen TV in an existing wall. The best part is there's no need to run cable from a panel box - or cut holes in your framing members. Just cut two holes in the wall and access power from an existing, nearby source....More

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