Author Topic: Earth Resistance Test ? (Read 381 times)

squelch · « **on:** February 22, 2012, 03:17:17 PM »

ano ba ang principle / concepts of ground resistance test ? nacoconfuse lang ako..

Philippine Electronics Forum · « **on:** February 22, 2012, 03:17:17 PM »

tony · « **Reply #1 on:** February 22, 2012, 06:17:02 PM »

get confused some more....

ano ang hindi malinaw?

http://www.google.com.ph/webhp?sourceid=chrome-instant&ix=ieb&ie=UTF-8&ion=1#hl=tl&gs_nf=1&cp=23&gs_id=t&xhr=t&q=earth+resistance+testing&pf=p&sclient=psy-ab&biw=1366&bih=653&site=webhp&source=hp&pbx=1&oq=earth+resistance+testin&aq=0L&aqi=g-L3g-vL1&aql=&gs_sm=&gs_upl=&bav=on.2,or.r_gc.r_pw.,cf.osb&fp=3ae92902d3cd0cc7&ix=ieb&ion=1

http://www.weschler.com/_upload/sitepdfs/techref/gettingdowntoearth.pdf
http://support.fluke.com/find-sales/Download/Asset/2633834_6115_ENG_A_W.PDF
http://www.electrotest.co.nz/PDF/grdbook.pdf

Philippine Electronics Forum · « **Reply #1 on:** February 22, 2012, 06:17:02 PM »

RiDdLeR??? · « **Reply #2 on:** February 22, 2012, 06:20:29 PM »

In short, kailangan the resistance from the surrounding earth towards any metal objects that are grounded to earth must be as small as possible.

Bakit? Because for lightning strikes which are hundreds of thousands of volts, even milliohms makes the difference if the elctric path will be dissipated directly to earth or not.

Philippine Electronics Forum · « **Reply #2 on:** February 22, 2012, 06:20:29 PM »

tony · « **Reply #3 on:** February 22, 2012, 08:02:55 PM »

this a safety requirement...to prevent electrocution of persons around an electrical appliance....

Philippine Electronics Forum · « **Reply #3 on:** February 22, 2012, 08:02:55 PM »

insomartin · « **Reply #4 on:** February 22, 2012, 08:17:06 PM »

Quote from: tony on February 22, 2012, 08:02:55 PM

this a safety requirement...to prevent electrocution of persons around an electrical appliance....

I CONCUR. eto lang simple explanation.

Philippine Electronics Forum · « **Reply #4 on:** February 22, 2012, 08:17:06 PM »

RiDdLeR??? · « **Reply #5 on:** February 22, 2012, 09:45:28 PM »

In my previous line of work, its not to protect people but to protect euipment specially from lightning strikes which is why we measure the earth resistance as every less milliohm counts.

tony · « **Reply #6 on:** February 23, 2012, 10:39:03 AM »

a protected equipment protects people first and foremost....

iyo karpo · « **Reply #7 on:** February 24, 2012, 10:43:35 AM »

http://www.aemc.com/techinfo/html/Tech-GroundTesters.asp

robbietan · « **Reply #8 on:** March 02, 2012, 11:23:41 AM »

ground resistance for distribution companies are kept below 5 ohms so that energy can be dissipated better.

a practical "how-to" using a ground resistance tester

http://www.fluke.eu/comx/show_product.aspx?locale=uken&type=17&pid=35485

tony · « **Reply #9 on:** March 02, 2012, 12:11:24 PM »

in the facilities that i have worked on, individual rod resistances are 10ohms, while the grid is 1 ohms or better....

iyo karpo · « **Reply #10 on:** March 05, 2012, 05:38:27 AM »

http://www.hubbellpowersystems.com/literature/encyclopedia-grounding/

Philippine Electronics Forum · « **Reply #10 on:** March 05, 2012, 05:38:27 AM »

Philippine Electronics Forum