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Post by jakedaniel on Mar 4, 2017 17:12:13 GMT
Like the title says, I want to install a 3 prong grounded cord. It's got what I assume to be the factory 2 prong cord on it. I know where to connect the first 2 wires of the cord but where should I attach the ground wire?
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Post by Ron Rich on Mar 4, 2017 17:22:58 GMT
Jake,
IMHO, you should NOT connect the green wire any where ! 1. If in the most of the USA, it is not legal to do so, unless you re-submit the whole phonograph to UL for re-testing. 2. You should replace it with a polarized, two wire cord correctly installed.3. IMHO, if you are worried about safety, you should connect it to a GFIC system-- MUCH safer ( if you "test it") then a 3 wire cord. Ron Rich
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Post by maxhifi on Mar 4, 2017 20:04:00 GMT
Put a crimp-on ring lug such as a t&b stakon on the green wire, drill a hole in the metal frame of the machine near where the power cord enters, scrape off the paint under where the lug will sit and attach it with a machine screw, with a nut and a lock washer. Make sure you attach it to metal which is connected to the frame/enclosure of the machine:
That way any fault inside the machine will blow a fuse instead of electrify the enclosure. Since the jukebox is a freestanding piece of equipment there's no chance of ground loops.
This is a good idea for improved safety, there's no way the old boxes would pass a modern UL test as-is, I disagree that they should be left with a two prong plug. If you need more specific info research how people do this with old guitar amps.
GFCI is a good idea too but three prong plug plus GFCI is even better.
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Post by Ron Rich on Mar 4, 2017 20:14:52 GMT
Hi Max,
I totally dis-agree with you, as doing as you suggest, can cause the outside metal to be "hot"-- There is no polarization on the plug that goes from the internal (brown "plastic"), AC socket to the the chassis. It, IMHO, is also wise to replace the internal, short power cord with a polarized cord--the internal outlet is polarized, on theses phonos. A working GFIC unit is no more " safe" with or without a grounded unit --
Ron Rich
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Post by maxhifi on Mar 4, 2017 21:54:56 GMT
I am a bit confused here - how could connecting the chassis to ground cause it to become hot? A three prong plug is by default also polarized, it just adds the direct connection of the chassis to safety ground. That's why fridges, washing machines, etc are all wired this way.
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Post by Ron Rich on Mar 4, 2017 22:01:50 GMT
Because the internal power cord is not polarized, and there is a 50/50 chance it's plugged in "wrong" .
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Post by maxhifi on Mar 4, 2017 22:22:39 GMT
But the green wire doesn't connect to the internal wiring, only to the metal box which holds everything. It should never carry any current except during a fault, if a failed wire happens to touch the enclosure.
It should never, ever be connected to the neutral prong of the power cord, in such case it would be very dangerous.
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Post by maxhifi on Mar 4, 2017 22:28:06 GMT
This is how my 147 is done - to be honest I would not want to use it without the added ground, a fault in the 70 year old motor or transformers could electrify the metal cabinet and its unsuspecting operator (i.e. Me!) Attachments:
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Post by Ron Rich on Mar 4, 2017 22:33:58 GMT
That's your opinion-- I would not trust it without a GFI! Check the NEC code, or, check with UL--- Iam just repeating what I was told by a UL inspector-- Ron Rich
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Post by jakedaniel on Mar 6, 2017 4:42:51 GMT
That's your opinion-- I would not trust it without a GFI! Check the NEC code, or, check with UL--- Iam just repeating what I was told by a UL inspector-- Ron Rich I can swap the outlet in he wall with a gfci outlet and plug it into that. I've got a good 2 prong polarized cord to use on the jukebox. Sounds like that is the way I'll go. |
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Post by glennnik on Sept 17, 2022 12:30:19 GMT
I agree with maxhifi, that hot leg of the 115 volt could accidently get touching any metal on that juke box and no fuse would blow or circuit breaker trip.
If an individual was to drop a coin in the slot and or touch any part of that metal jukebox he or she would more then likely be the ground and would start dancing before the music ever stared playing.
I took what Ron mentioned but ! I removed the two prong outlet from the jukebox cabinet and replaced it with a GFI outlet that it's power cord is a 3 prong plug to the wall. I also removed and replaced the two prong plug from the wired receiver section and replaced it with a 3 prong plug and took the green ground to the metal chassis. What I should check is that any metal part of that juke box is grounded, and if not just run a green wire from the wired chassis section to it.
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Post by jukeboxmarty on Sept 18, 2022 2:46:38 GMT
I have to weigh in here....
If the jukebox cabinet or chassis is properly grounded via a 3-wire line cord (green wire), it becomes IMPOSSIBLE for the cabinet to exhibit 'hot' current.
That's what the 3-line ground cord is designed to do! Any potential current will be shunted to ground!
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