How TAMPER RESISTANT RECEPTACLES Work & Where They're Required By The National Electrical Code
Tamper Resistant receptacles can be a pain in the butt to plug things into, so many homeowners and business owners request that we don't put them in. But there is an important reason why they're required by the National Electrical Code. Let's break one open and see how it works, then talk about the NEC articles associated with them.
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PRODUCTS USED IN VIDEO
Tamper Resistant Receptacle: https://amzn.to/2XSnjjD
Klein Flathead Screwdriver: https://amzn.to/3iteZjW
30amp Receptacle: https://amzn.to/3o9I6tW
NEC 2020 Codebook: https://amzn.to/3972SGl
Tamper Resistant Receptacles or TRR’s
· Article 406.12 of the 2020 NEC
· Finally being fully incorporated in 2008, these protective receptacles have been found in the NEC since the early 80’s,the code requiring “Tamper Proof” receptacles in all pediatric care facilities by 1981 and later psychiatric wards in 1984. The terminology switched to “Tamper Resistant” in 1990, the NEC dropping it’s requirements for psychiatric wards in 1993.
· TRRs are required for all 15- & 20-amp receptacles below 5ft 6 in (66”) in all areas children might find themselves wandering about, including residential buildings, childcare facilities, hotels, waiting rooms/ hallways of medical facilities, and most "assembly occupancies" (auditoriums, gyms, transportation waiting lobbies, skating rinks etc.) exception: appliance circuits that are not easily accessible (mircowave, fridge and others)
· How? Internal shutters on loaded springs block foreign objects from being inserted until an equal force is applied into both the hot and neutral terminals. If excessive force is needed, it usually means uneven pressure is being applied by the blades of the plug or there is a problem with the receptacle itself.
· Why? TRRs so far appear to be the most complete solution to childhood shock/electrocution caused by receptacles. The most common objects inserted into receptacles being hairpins, keys and paper clips. Outlet caps (the most common and affordable option) seem to provide very little protection. Studies prove that most children over two could remove caps, and the risk of babies putting the caps in their mouths outweighed the benefit of shock protection. In fact, plastic plug inserts are not approved by any of the major listing companies for child protection uses, only listed as insulating devices aimed at energy conservation.
· Price differs between TR and standard by only around 50 cents per plug, and as a standard middle-class home usually has less than 100 plugs, that’s only a $50 difference in material!
Stay safe out there folks! Love from the ATX
History of TRRs https://www.ecmweb.com/content/article/20889596/tamperresistant-receptacles-the-rules-have-changed
National Fire Protection Agency https://www.nfpa.org/
#electricalshock #tamperresistant #receptacles
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