long long ago, the Bell System used a cable clamp to assure that power lead to their customer-premises devices (speakerphones, modems, etc) were secured to the center screw of an outlet box. the device was two pieces - one encircled the power cord, the second went parallel to the plug and was held by the junction box cover; the two pieces were loosely riveted together.
we have a situation where the plug for a building router is plugged into a ceiling junction box - and we don't want the plug to be shaken out of place (we are in earthquake country).
has anybody seen (or does anybody remember) these devices? i haven't seen one since the 1970's.
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