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OK that is one case where your need two failures to cause a hot chassis.
Now for Doofus to get electrocuted he will also have to have one hand on this deaf radio and one hand on the radio that has a metal chassis that is plugged into a socket with a good ground. The problem you could also have a similar problem even if the neutral was wired correctly (not tied to ground). If the ground wire broke in the cord or inside the radio and then a capacitor or a transformer had an internal short to the chassis or there was a resistor from hot to chassis ground then the chassis would become hot. The so called safety ground is not a 100% sure thing in the case of a failure. Because safety grounds are as prone to fail as anything a third external wire tying all metal cabinet radios together is the only safety measure if one has a table full of these old AC powered beasts. Yes it is not a good policy to tie the ground and neutral together. I just felt that a good explanation of why not to do so was required instead of just a blanket statement stating "The safety ground must NEVER be connected to the neutral at the load !NEVER! " But he on the safe side and ground those boatanchors together. (you can buy a bigger boat that way). Thanks Ron WA0KDS Doofus, likes to unplug his FT101E whenever he isn't using it, and he likes to windup the cord to look just like it did when the radio was new-in-the-box. After doing this for a while, the neutral lead breaks. Doofus plugs in his radio, and trys it out, and it works just fine! Doofus continues operating this way, and eventually, another wire in the cord breaks. If that wire happens to be the hot lead, the radio will quit, and barefoot Doofus will take the radio back to the squire for a rewire job. If that wire happens to be the safety ground lead, the chassis of the FT101E will now be at full power line potential (current passing from hot lead through the radio's circuits, to the chassis/hot- connection), and barefoot Doofus will be pushing up daisies. |
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