Can we check DC Supply By Using Line Tester | Electrical Interview Question | Electrical Technician

Can we check DC Supply By Using Line Tester
Working principle of Tester:
Tester is consisting of a small lamp, resister and spring contact and screw tip. All the arrangement will be connected in series with each other. When the man touches the 230 Volts Line conductor, the current flow starts from tester tip - resister - bulb - spring contact- human body - ground. Due to this current flow the tester lamp starts glowing. You should focus on here. where the current flow passes through the ground - source. The electron reaches the source through ground. Therefore, the AC system the source of the neutral should be grounded properly.
In case if you did not ground the neutral terminal, then your tester does not glow when the technician touches his tester in live part.
Why Tester do not glow on DC supply:
Coming to Direct current source, which has two terminals, considering as positive and negative. In this, both terminal has some potential, which means if you have 110 Volts DC supply means, the voltage across positive to ground will be +55 Volts and the voltage across the negative terminal will be -55 volts. Hence the DC system negative terminal is not recommended to connect with ground terminal. So that, DC negative or positive terminal is not connected with the ground that’s why the technician touches the DC source terminal means, the tester does not glow because of there is not path to flow of current. This is the main reason for tester is not glowing on DC source.
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[@deepakmandal7626]

Bahut Achcha Jankari Diya Sar ji

[@ThangiahGopal-iy2hg]

சிறப்பு👍

[@Tamiltech360senthil]

Nice explain

[@sandeepchandrakar1090]

220 v DC ko ground krenge to Kya vo bettery discharge nhi hoga

[@electricalsir]

Yes sir

[@aliqadri4672]

Aik question ye bhi hay kay bike ki battery ka negetive to har waqt chasis kay ground kay sath connect rehta hay to bettery discharge kion nai hoti or ager hoti bhi hay to positive pay tester lgany pay wo hamari body say ground hoky glow kio nai hota??

[@dashok4749]

Informative vdo thank u

[@asishthanapati7614]

Good brother

[@mritunjoymandal1605]

👍👍👍

[@aliqadri4672]

Apky kheny ka mtlb ac supply may tester ka circiut hamari body say ground kay zrye transformer kay negetive say jaa ky connect hota hy..???

[@niteishkaalia1148]

sir ji agar tester ko 12v ya 24v dc power supply adpater(ac to dc) per lgaye toh positive+ and negative - dono side tester glow krta hai aisa kyu

[@baqarrizvi8740]

sir solar inverter ke pv side + aur - dono pe tester kyn glow krta ha

[@ghulamirtaza8404]

Sir agar charger ho or us ko hum ne DC pin lagani humain kese pata chalay ga ke DC phase supply kis wire main hai or wire colour bhi same ho 2 nu ???

[@shivkumar-kk8wx]

Nice explanation

[@mohammedshahid5317]

220vdc ko ground Karne se 110vdc hoga, tester ko glow Karne me leye 150v chaye eh kaise hoga explain karren.

[@aliqadri4672]

Ho sakta hy tester ko 110v dc possitive say mil jaey or phir 110v dc hamri body ki zarye ground hoky battery kay negetiv say connect ho jaey jo ground hay or 220 ho jaey ..may be

[@User_Rj43]

Sound kum reh gai is video ki