Description: Mercury light switches were manufactured prior to 1991. Mercury light switches are sometimes encountered in older buildings. These devices look like typical wall switches, but they do not make the audible "click" sound when activated. They operate on the principal of liquid mercury in a metal encased glass button that completes the electrical circuit when the switch is lifted up, submerging an electrical contact point. These switches are often referred to as "silent switches."
How to Identify: Mounted on walls near doors and walkways.
Amount of Mercury: About 2 grams
Safe Removal: Remove the whole switch from the wall very carefully as not to release any of the mercury from the switch.
If breakage occurs, immediately contain and clean up the spill.
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