New answers tagged safety
There are small plug-in devices with LED indicators that you plug into the socket; you can probably get one at a hardware store. The LED lights will indicate any wiring problems such as lack of ground, or confirm proper installation.
I visited a house last week that had 4 grooves routed in each tread. It looked really good and definitely helped with your foot slipping. Also it is a better long term answer than a non skid paint.
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