Why do some power tools not have a ground?
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Just so, is the grounding prong necessary?
3-Prong Outlets This grounding path serves as a primary safety means if there is a short circuit or other damage to the electrical circuit or appliance. The grounding wire in the circuit and on the appliance or tool is not required to make the appliance work.
Secondly, why do Lamps not have a ground? The reason that some do not have an equipment grounding conductor is that the minimum safety standards of the NEC do not require them to be with an equipment grounding conductor because they are not listed in article 250-114 of the NEC listing all that is to be with an equipment grounding conductor.
Secondly, what is necessary if an electrically powered tool requires a ground?
29 CFR 1926.404(f)(7)(iv) states that electric power tools must be grounded except when they are double insulated. Also, double insulated tools must be distinctively marked. Note: Class designations in the standard for electric equipment refer to suitability for use in a hazardous location.
Can I break off the ground prong?
If you absolutely have to cut it off, it'll work, but you should really only do so when you don't have any other option. I would instead recommend plugging your three prong plug into a three prong receptacle and avoid taking the unnecessary risk. When you cut the “third prong” off you are cutting off the ground.