Technically Speaking

Body Resistance – A Review

This UL Bulletin of Research on the electric fence contains much information that applies to much more than just the electric fence. This is why it is a classic work.

On Limited-Current Circuits

A Product Safety Newsletter reader asked about where limited-current circuits are required by IEC...

Testing Purposes

Every product is subjected to a suite of tests. What are the purposes of...

Capacitive Discharge Shock from CRT Faceplates

While cleaning the CRT faceplate of the computer color monitor display, a person received...

Some Thoughts About Interlocks

Recently I’ve had occasion to consider the subject of interlocks. I thought I would...

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Selecting a Fuse Value

Product Safety Newsletter - May/June 1990 Recently, a colleague asked, “How do I select the...

The Use of Overcurrent Protection in Plug-and-Socket Connected Equipment

Product Safety Newsletter - March/April 1990 Consider the “direct plug-in” Class 2 transformer-power supply commonly...

The Pitfalls of Pass/Fail Testing

You’re at your desk when the phone rings. It’s one of your production lines;...

Electrically-Caused Fire in Multilayer Circuit Boards

A few months ago, a colleague asked whether he needed a fuse in series...

Theory of Equipment Grounding Impedance

Values for grounding impedance appear in many standards, including UL 478 and 1244, CSA...

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