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.Jens
Senior Member
Joined: 06 Dec 2011
Posts: 383
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 Posted: Fri Jun 29, 2012 4:45 pm Post subject: |
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| davc1 wrote: |
we still have many many electric gadgets that use only 2 prongs .. !
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That is no problem, if the "gadget" provides double isolation of the power supply. A (over-)simplified thumb rule would be: If the chassis and housing of a device is made of isolating material, it's safe to forego safety ground (THIS APPLIES TO THE MANUFACTURER! IF A DEVICE IS MEANT TO USE SAFTEY GROUND, USE IT!)
So, in other words, there are ways to safely design a "gadget" without need for grounding. But other devices - depending on their design - will need it. |
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Thoraldus
Platinum Member
Joined: 28 Nov 2010
Posts: 2061
Location: Rocky Mountains - SE IDaho
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| Posted: Fri Jun 29, 2012 5:45 pm Post subject: |
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| .Jens wrote: | | davc1 wrote: |
we still have many many electric gadgets that use only 2 prongs .. !
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That is no problem, if the "gadget" provides double isolation of the power supply. A (over-)simplified thumb rule would be: If the chassis and housing of a device is made of isolating material, it's safe to forego safety ground (THIS APPLIES TO THE MANUFACTURER! IF A DEVICE IS MEANT TO USE SAFTEY GROUND, USE IT!)
So, in other words, there are ways to safely design a "gadget" without need for grounding. But other devices - depending on their design - will need it. |
+1
_________________
”It’s easy to play any musical instrument: all you have to do is touch the right key at the right time and the instrument will play itself.”
Johann Sebastian Bach
----------------------------------------------
Rick Stirling - Retired Electrical Engineer - Erstwhile Photographer
Korg Kronos2, Casio MZ-X500, PA600, AKAI MPD32, M-Audio Oxygen 25, ZOOM H6, Cakewalk Sonar |
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davc1
Joined: 21 Aug 2011
Posts: 11
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| Posted: Fri Jun 29, 2012 7:08 pm Post subject: |
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and you are assuming all the A/C outlets are properly installed , maintained and grounded ...
besides DI boxes ... there are other Safe Hum Eliminators ...
or yet another gadget ... unless i should list the millions of such
' gadgets ' ... instead of using a common catch all kinda phrase ...
since we are not there .. we can only assume ... and make suggestions from decades of experience which hasn't killed us yet ...
if you freakin know Everything .. then get in your car and go help the guy ... |
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michelkeijzers
Approved Merchant
Joined: 08 Feb 2007
Posts: 9113
Location: Netherlands
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| Posted: Fri Jun 29, 2012 10:15 pm Post subject: |
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| Thoraldus wrote: | | michelkeijzers wrote: | | davc1 wrote: | | i always worried more about using A/C Ground lifts on bass/gtr rigs , especially if they sang ... then you can get a good Zapp ... you Will see that bright light for a second or two ... ! |
One of our guitarists sometimes gets a shock when touching his lips to the mic he sings through. Strange is that the other guitarist who also sings never has this problem. Both have about the same gear, and are on the same electrical group.
We advised him to use a 'cap' over the mic but maybe there are better solutions like a DI box, ground lift of PA or guitar rig or maybe some other solutions? Please let me know. |
Could be as simple as his shoes are conductive and the others are not. I'd do a serious check to see why his mic is hot.  |
Ok I pass the message to him next rehearsal.; thanks for answering.
_________________
Developer of the free PCG file managing application for most Korg workstations: PCG Tools, see https://www.kronoshaven.com/pcgtools/ |
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Thoraldus
Platinum Member
Joined: 28 Nov 2010
Posts: 2061
Location: Rocky Mountains - SE IDaho
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| Posted: Mon Jul 02, 2012 12:03 am Post subject: |
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| davc1 wrote: | and you are assuming all the A/C outlets are properly installed , maintained and grounded ...
[snip] |
Never assume. I carry one of these in my kit bag to test all outlets before using them.
_________________
”It’s easy to play any musical instrument: all you have to do is touch the right key at the right time and the instrument will play itself.”
Johann Sebastian Bach
----------------------------------------------
Rick Stirling - Retired Electrical Engineer - Erstwhile Photographer
Korg Kronos2, Casio MZ-X500, PA600, AKAI MPD32, M-Audio Oxygen 25, ZOOM H6, Cakewalk Sonar |
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jeremykeys
Platinum Member
Joined: 19 Jun 2011
Posts: 3092
Location: Toronto, Ontario, Canada
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| Posted: Wed Jul 25, 2012 11:53 pm Post subject: |
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Thoealdus is suggesting what I would have suggested next. Always test your power outlets. Never assume they are wired correctly. You never know when an idiot has messed with something!
_________________
If music is the food of love, play on and play loud!
Gear: Kronos 73, Triton Pro-X, Wavestation EX, Polysix, King Korg, Monotron and Monotron Duo, Minikorg, Moog Grandmother, 1 Roland U-20, Hammond M3, 4 acoustic and 6 electric guitars, 1 Ibanez 5 string bass, a bunch of microphones and other very cool toys, 1 wife and 3 cats! |
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