JTAS 10-xl-1 grounding wire

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Forum topic by horseman308 posted 08-25-2014 09:16 AM 1116 views 0 times favorited 12 replies Add to Favorites Watch
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9 posts in 1414 days

08-25-2014 09:16 AM

I’ve got my new-to-me Jet almost set up, but I noticed that the previous owner disconnected the grounding wire inside the smaller case that is connected to the motor housing (not the main on/off switch housing). I’ve looked at the wiring schematic in the manual, but it doesn’t look very clear to me. I also asked Jet customer service by posting the same picture below and asking which of the empty screws in the pic the ground should be attached to. The reply was less than helpful – “looks about right to me.”

Could someone who owns one of these or is familiar with them take a quick look at the pic (and maybe their saw if need be) and tell me where it’s supposed to go? Thanks!

12 replies so far

View KS_Sparky's profile


26 posts in 1648 days

#1 posted 08-25-2014 01:11 PM

With very little context, I’d say the silver screw. Newer machinery would have a green hexagonal screw. There would probably also be a G, GR, or a symbol with a vertical line and two or three horizontal lines under the vertical line. Your machine may not have any of these. The brass screw in the upper right apppears to be a mounting screw. Ideally, you want a screw that serves no other purpose than equipment grounding. If you have a basic multimeter, you can check to make sure that the silver screw is continuous to all metal parts of the frame, motor case, etc (you may have to scratch some paint) but not continuous to the terminal screws the other wires are landed on.

The purpose of equipment grounding is to provide a safe path for current in the case of a short to the frame. This low resistance pathway will allow a large current flow that will nearly instantly trip the circuit breaker. Without equipment grounding, the frame would be energized and await a low resistance pathway, i.e. you!

-- apprentice Electrician, IBEW L.U. 226

View TheFridge's profile


9608 posts in 1511 days

#2 posted 08-25-2014 01:38 PM

More than likely it lands under the bottom right screw because it barely looks long enough to go to the top one. The best way would be to check continuity from the bottom right screw to the motor case. If it’s just a few ohms it’ll work just fine.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

View bigblockyeti's profile


5139 posts in 1746 days

#3 posted 08-25-2014 02:11 PM

Either of the pictured screws that mount the junction box to the side of the motor would be a good ground. It looks like the bottom right screw is the one that was used as it’s closer to where the cord comes into the box. +1 to checking the continuity to ensure you have a good ground.

View Crank50's profile


173 posts in 1602 days

#4 posted 08-25-2014 03:27 PM

It certainly does not go under either of the screws that already have a wire attached. Those are the hots.
Often, the ground wire goes under the screw that holds the cover on the junction box.
You basically just want it attached to anything metal that is directly, mechanically connected to the motor case.

View horseman308's profile


9 posts in 1414 days

#5 posted 08-25-2014 04:45 PM

Sparky – thanks for that info. There are no green screws, but I’ll check for the signs. Glad to have an electrician answer, cause I’d really like to avoid that particular health hazard.

Crank, I’d actually thought about that. There’s a rubber gasket that goes between the cover and the junction box. I’m imagining that the gasket would defeat the purpose of the ground, but am I wrong?

Sorry to ask what are probably obvious questions, but I’d rather look like a small idiot than wind up prematurely in the obituaries as a big idiot.

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3584 posts in 3394 days

#6 posted 08-25-2014 05:10 PM

Green wire goes on the silver screw beside the black wire.

View TheDane's profile


5441 posts in 3688 days

#7 posted 08-25-2014 06:08 PM

Does it strike anybody else as odd that someone would go the effort to disconnect the ground wire?

Maybe it came from the factory that way, but you have to wonder if there was a reason.

-- Gerry -- "I don't plan to ever really grow up ... I'm just going to learn how to act in public!"

View bigblockyeti's profile


5139 posts in 1746 days

#8 posted 08-25-2014 08:56 PM

Certainly doesn’t seem too smart disconnecting a ground wire for no obvious reason, wonder if it was hooked up to a touchy GFI circuit?

View horseman308's profile


9 posts in 1414 days

#9 posted 08-26-2014 11:59 PM

Got it figured out. There was a screw hole with no paint around it and with a big hole cut out of the gasket that separates the motor housing from the panel case. It was hidden beneath a bunch of saw dust. Thanks for the help guys.

View Nickdarr's profile


69 posts in 2056 days

#10 posted 08-27-2014 12:11 AM

Glad you found it. Good luck with the resto.

-- Darren... Hmmmm, I got nothin.

View horseman308's profile


9 posts in 1414 days

#11 posted 08-27-2014 12:51 AM

Thanks. It’s almost done. The previous owner had the table set up for cutting left of the blade – no idea why. So today I got the extensions swapped around, squared the blade to the miter slot, and remounted the rails for the Excalibur fence. He never had the digital read-out for the Excalibur, so I’ve got to rig up a regular tape-and-pointer setup, but it’s basically good to go. It cuts great with a new Freud Diablo!

View KS_Sparky's profile


26 posts in 1648 days

#12 posted 08-27-2014 01:18 AM

Removing the equipment grounding wire should have no bearing on the performance of the GFCI, as they work by sensing current on the hot and neutral conductors only. But it does make you wonder…is the factory male end still on the cord or is it a replacement? I wonder if thats the only place it was disconnected. Also, why would there be a screw behind the gasket?

-- apprentice Electrician, IBEW L.U. 226

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