Electronics Lab Philippines

Clean out grounding design

Offline Super zHero

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Re: Clean out grounding design
« Reply #40 on: December 16, 2014, 01:09:45 PM »
The main purpose of a wrist or foot strap is to avoid the build-up of static electricity on a person's body.  A 1meg resistor is good enough to do the job.  On assembly lines or test benches, they are tested first or should be tested per ISO standards and requirements EVERY TIME they put on.

Any misuse or deviation from the safety standards is the wearer's risk.

Offline tony

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Re: Clean out grounding design
« Reply #41 on: December 16, 2014, 01:22:19 PM »
static electricity is a real shocker....
i remember the many episodes in Russia wherein
i saw sparks jump from my hand to the brass doorknob, tickled me a lot,
sometimes with sounds too...;)
* you simulate a circuit because you know how it works and wants to tweak, not because you want to learn how that circuit works....simulations do not teach you to be circuit smart...it comes with experience....
*http://www.diyaudio.com/forums/power-supplies/191730-tonys-latest-traffo-diy-build-15.html#post4375385
*do not judge any amp by its schematics, drawing lang yon, look instead at the finished amp, it tells a lot about the amp and its builder.....
http://ronelex.com/bias-current-output-transistor-amplifier/156

Offline @badoy

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Re: Clean out grounding design
« Reply #42 on: December 17, 2014, 09:06:14 AM »
kaya maraming nagpupunta sa amin kase ung mga workers ng electronics assempbly ei nakukuryente sa mga wrist straps nila. ayaw kase nilang i-bond ang data at electrical grounding
It is evident that there is something wrong with the system design or workmanship issue. I already supervised one of the R&D company located at Ortigas Center (the company is based on Singapore) The building has two grounding provisions one for the data and one for the electrical but unfortunately after the series of testing conducted by group of Singaporean engineers the grounding system did not pass in their standards because of noise and interference. So, one of the solution is they installed separate grounding.

I guess loops will be prevented if the system is well design by the fully equipped engineers.

Offline @badoy

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Re: Clean out grounding design
« Reply #43 on: December 17, 2014, 09:08:19 AM »
Ang common point dito sir tony is yung 4th wire ng high side, return wire ng secondary ay nakakonek rin sa ground rod katabi ng mga poste. So once magloose yung return wire sa entrada kapag hinawakan mo eh nangingiliti minsan which is usually a bare aluminum wire.
The only purpose of electrical grounding is to protect the human from equipment fault. Ngayun kung nakikiliti ka its time for you to troubleshoot the system dahil meron ka nang evidence of fault. makukuryente kalang kung meron nag-close loop from Line A, Line B & Line C going to equipment body. Hanapin mo yung sumayad na linya or baka nabasa.

Ground rods to ground rods cannot produce potential. It only absorb potential and if you noticed that there is an un-even potential between grounding pits then start doing maintenance works to your system to prevent loss of life and property.

Offline tony

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Re: Clean out grounding design
« Reply #44 on: December 17, 2014, 11:18:24 AM »
IME, for power substations the individual earthing rod must measure 10 ohms or better,
and the earthing grid connected to lessbetter than 2 ohms....instrument earthing is even more stringent,
1 ohm or less and triangulation of rods are mandatory, this is how seriously earthing is implemented in such plants...
* you simulate a circuit because you know how it works and wants to tweak, not because you want to learn how that circuit works....simulations do not teach you to be circuit smart...it comes with experience....
*http://www.diyaudio.com/forums/power-supplies/191730-tonys-latest-traffo-diy-build-15.html#post4375385
*do not judge any amp by its schematics, drawing lang yon, look instead at the finished amp, it tells a lot about the amp and its builder.....
http://ronelex.com/bias-current-output-transistor-amplifier/156

Offline Super zHero

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Re: Clean out grounding design
« Reply #45 on: December 17, 2014, 02:27:44 PM »
A common mistake is making the "instrument" ground the same as the lightning rod ground.

Offline >>>^żżż^<<<

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Re: Clean out grounding design
« Reply #46 on: December 17, 2014, 02:56:02 PM »
Ganyan minsan kapag walang dalang gnd rod naghahanap sa paligid at kapag nakakita dun ilalagay.


Minsan sa tubo ng tubig. Kaya minsan naghuhugas ka ng kamay eh meron nangingiliti.
http://www.elab.ph/index.php?topic=52236.0 TF?
http://www.elab.ph/index.php?topic=41860 ? ? ? DIY traffo Test Build Uli
http://www.elab.ph/index.php?topic=33717  I2c / spi programmer
http://www.elab.ph/index.php?topic=37150.0 Lcr esr makikigulo rin ba kayo ??? Test Build
http://www.elab.ph/index.php?topic=29963.0 Esr collection na malamig
http://www.elab.ph/index.php?topic=25854.0 Basic C++ Programming Tutorials by Prof Asimo
We only live once,treasure those we love, make friends not enemies and keep our family closer. And we will be at peace.
FISH

Offline Super zHero

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Re: Clean out grounding design
« Reply #47 on: December 17, 2014, 05:34:28 PM »
// eh ako minsan pagnaliligo, meron nangingiliti  ;D

Offline >>>^żżż^<<<

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Re: Clean out grounding design
« Reply #48 on: December 17, 2014, 05:47:40 PM »
Siguro me shower heater ka sir Z?
http://www.elab.ph/index.php?topic=52236.0 TF?
http://www.elab.ph/index.php?topic=41860 ? ? ? DIY traffo Test Build Uli
http://www.elab.ph/index.php?topic=33717  I2c / spi programmer
http://www.elab.ph/index.php?topic=37150.0 Lcr esr makikigulo rin ba kayo ??? Test Build
http://www.elab.ph/index.php?topic=29963.0 Esr collection na malamig
http://www.elab.ph/index.php?topic=25854.0 Basic C++ Programming Tutorials by Prof Asimo
We only live once,treasure those we love, make friends not enemies and keep our family closer. And we will be at peace.
FISH

Offline Super zHero

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Re: Clean out grounding design
« Reply #49 on: December 17, 2014, 05:57:25 PM »
,,,,hindi, meron dalagita na pumapasok sa banyo  ::)

Offline robbietan

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Re: Clean out grounding design
« Reply #50 on: December 18, 2014, 01:43:10 PM »
PLDT contractors, hindi na nagbabaon ng GND.  Umaasa na lang daw sila sa GND ng Meralco  ???

puede yan altho may noise issues minsan. the best is for  a separate ground rod tapos naka bond sa meralco grounding system
apqi.ph

Offline robbietan

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Re: Clean out grounding design
« Reply #51 on: December 18, 2014, 01:45:01 PM »
It is evident that there is something wrong with the system design or workmanship issue. I already supervised one of the R&D company located at Ortigas Center (the company is based on Singapore) The building has two grounding provisions one for the data and one for the electrical but unfortunately after the series of testing conducted by group of Singaporean engineers the grounding system did not pass in their standards because of noise and interference. So, one of the solution is they installed separate grounding.

I guess loops will be prevented if the system is well design by the fully equipped engineers.

maraming engineers kasi dito ang hindi pa ma experience on grounding and bonding issues.
apqi.ph

Offline robbietan

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Re: Clean out grounding design
« Reply #52 on: December 18, 2014, 01:47:59 PM »
The only purpose of electrical grounding is to protect the human from equipment fault. Ngayun kung nakikiliti ka its time for you to troubleshoot the system dahil meron ka nang evidence of fault. makukuryente kalang kung meron nag-close loop from Line A, Line B & Line C going to equipment body. Hanapin mo yung sumayad na linya or baka nabasa.

Ground rods to ground rods cannot produce potential. It only absorb potential and if you noticed that there is an un-even potential between grounding pits then start doing maintenance works to your system to prevent loss of life and property.

kung may fault at hindi nag trip ang protective devices, its either mali ang design ng protection (not common) or mali ang design ng grounding (more common). marami kasi ang akala ei kapag nagbaon ka ng ground rod ei tapos na ang grounding.
apqi.ph

Offline robbietan

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Re: Clean out grounding design
« Reply #53 on: December 18, 2014, 01:49:47 PM »
IME, for power substations the individual earthing rod must measure 10 ohms or better,
and the earthing grid connected to lessbetter than 2 ohms....instrument earthing is even more stringent,
1 ohm or less and triangulation of rods are mandatory, this is how seriously earthing is implemented in such plants...

5 ohms na ang standard ng meralco as many of their electronics need that level of resistance. hindi lang dapat sa substations, dapat sa lahat ng buildings ei ganyan ka stringent ang requirements
apqi.ph

Offline robbietan

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Re: Clean out grounding design
« Reply #54 on: December 18, 2014, 01:52:26 PM »
A common mistake is making the "instrument" ground the same as the lightning rod ground.

na dapat ei bonded lang. lightning rods should at least be 2 separate rods, one each per building corner
apqi.ph

Offline robbietan

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Re: Clean out grounding design
« Reply #55 on: December 18, 2014, 01:55:03 PM »
Ganyan minsan kapag walang dalang gnd rod naghahanap sa paligid at kapag nakakita dun ilalagay.


Minsan sa tubo ng tubig. Kaya minsan naghuhugas ka ng kamay eh meron nangingiliti.

ganyan kung masyadong mataas ang earth resistance or hindi maganda ang bonding ng grounded conductor sa tubo ng tubig.

assuming na metal ang tubo ng tubig at hindi plastic.... jejeje
apqi.ph

Offline robbietan

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Re: Clean out grounding design
« Reply #56 on: December 18, 2014, 01:55:46 PM »
// eh ako minsan pagnaliligo, meron nangingiliti  ;D

tsalap iyan
apqi.ph

Offline kmb36td

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Re: Clean out grounding design
« Reply #57 on: December 18, 2014, 02:59:24 PM »
less common yata ang static electricity sa pinas... because of the very high humidity... sa mga may snow at desert na country uso yun kasi dry ang air nila...... at saka di rin sila namamawis sa kamay di katulad natin...

Offline >>>^żżż^<<<

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Re: Clean out grounding design
« Reply #58 on: December 18, 2014, 03:02:40 PM »
Dahil sa mga damit nila siguro? at karaniwan yata sa kanila meron nakalatag na carpet sa sahig.
http://www.elab.ph/index.php?topic=52236.0 TF?
http://www.elab.ph/index.php?topic=41860 ? ? ? DIY traffo Test Build Uli
http://www.elab.ph/index.php?topic=33717  I2c / spi programmer
http://www.elab.ph/index.php?topic=37150.0 Lcr esr makikigulo rin ba kayo ??? Test Build
http://www.elab.ph/index.php?topic=29963.0 Esr collection na malamig
http://www.elab.ph/index.php?topic=25854.0 Basic C++ Programming Tutorials by Prof Asimo
We only live once,treasure those we love, make friends not enemies and keep our family closer. And we will be at peace.
FISH

Offline motion55

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Re: Clean out grounding design
« Reply #59 on: December 18, 2014, 03:46:14 PM »
Dahil sa mga damit nila siguro? at karaniwan yata sa kanila meron nakalatag na carpet sa sahig.

Hindi siguro nilagyan ng Downy. Nakakabawas daw ng static electricity ang Downy.
"Set your mind free!"