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Author Topic: power supply when grouned/heating up?  (Read 663 times)
K1JK
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Posts: 207




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« on: September 25, 2009, 08:50:08 AM »

hi guys
got power supply- 120vac to 12vdc(newmar-35a)
it had no plug on power cord.
put plug on for ac outlet (3 prong -green wire ground)
it heats up. hot to touch/ also see small arc from coax ceneter when center touchs rigs-so-239
-----when green wire is
disconnected from plug it runs fine and cool and
no spark at rig and it runs fine and tunes up
is there prob with house ground??
rig and tuner grounded together going outside
pipe in ground? pipe is for well water.
thanks
jeff k
kb1sqg
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WB2WIK
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Posts: 20574




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« Reply #1 on: September 25, 2009, 12:54:51 PM »

Sounds like the power supply has an internal fault with substantial leakage current to ground.
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AA4PB
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Posts: 12793




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« Reply #2 on: September 25, 2009, 01:39:39 PM »

Make sure you don't have the hot and neutral reversed in the plug. The neutral should be the white wire (hot is black) and it should go to the left pin when looking at the rear of the plug with the ground pin down. That corresponds to the larger of the two slots on the receptical.

Ordinarily the two wires just go to a transformer primary and it wouldn't make any difference, but you never know what they might have internally connected (like a bypass capacitor) between neutral and ground.

You might also get one of those outlet testers for a few bucks from Home Depot or similar store. The lights on the tester will tell you if the outlet is wired correctly.
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K1JK
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Posts: 207




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« Reply #3 on: September 25, 2009, 02:59:37 PM »

thanks guys
power supply 12yrs old/will check wiring
jeff k
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