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17 March 2010

Answer to Question #4757 Submitted to "Ask the Experts"

Category: Consumer Products — Electronic: TV, Computers

The following question was answered by an expert in the appropriate field:

I work in a historical archive. We recently acquired a Telephone/Telegraph Converter, model TA-182/U. We are using the converter for show purposes only, not for use, but the manual says: "WARNING DANGEROUS VOLTAGE AND RADIATION HAZARDS ARE CONSTANTLY PRESENT IN THIS EQUIPMENT, THEREFORE, IT IS ESSENTIAL THAT SAFETY MEASURES BE INSTITUTED." The only problem is that we don't know what measures should be instituted. My question is how should I properly store this converter? It is in a metal box (original packaging) and will probably stay in the box to show also.

Not to worry; so long as the box is not energized—i.e., plugged in to a wall socket or otherwise connected to an electrical power source—there will be no high voltage nor any radiation produced. Thus it can be handled and displayed without fear. It is a good question you posed, however.

Note that x rays are sometimes produced as an unwanted byproduct of an electrical apparatus that operates at high voltages. Typically, at least 10,000 volts (10 kV) are necessary to produce x rays. Recall the early color televisions—they had a rectifier tube that operated at about 20 kV, and many of the early sets leaked low levels of x rays. This problem, by the way, was solved by the Electronic Products Act of 1970, which led to standards and improved designs. Color TVs of the past three decades are safe, so enjoy your favorite programs without fear.

Ron Kathren
Professor Emeritus
Washington State University

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