Kā lietot lietot a multimetrs to mērīt vai zemējums ir labs vai slikts
Ikviens kurš zina elektrību zina ka tas zemējums vads ir svarīgs, un zemējums var spēlēt a dzīvības glābšana loma in kritiskas situācijas. For the zemējums vads to darbs, it jābūt savienotam no zemējuma caurums no trīs-caurums 2c to mājas zemējums bagāžnieks, to the zemējums bagāžnieks of viss ēka, un tad to zemējums stabs palikt savienots. Vispārīgi, the zemējums pretestība vajadzētu būt mazāk nekā 4 omi.
How to use a multimeter to measure whether the grounding is good or bad? General, you can use the resistance setting of a multimeter, connect a test lead to the ground hole of the socket, and connect one end to apred steel bars, or even steel water pipes entering the home. Ja mērs pretestība vērtība ir relatīvi mazs (in It can range from a few ohms to ducens of ohms, jo this measurement method is only approximate, and we can-guarantee that the apred steel bars and household steel water pipes are well grounded), then it can can basicly be judged that the grounding wire is effective. If the measured resistance is s several hundred ohms or even vairāki megohms, it can be būtībā spriests tas zeme vads is neizdevās. Of course, if you want to measure accurately, you need to use a grounding megger or a zemējums pretestība testeris to test the zemējums pretestība.
Iemesli iemesli zemējums kļūme ir as šādi: Pirmais, zemējums pols of the ligzda is nav savienots ar the zemējums vads vai the zemējums vads is nav savienots. Second, there is is a break in the ground wire. Third, the ground wire is not connected to the ground electrode. Fourth, there is no zemējums elektrods at all.
Tomēr, in mājsaimniecība elektrība lietošana, vai zeme vads ir savienots un vai it ir efektīvs. Atbilde vajadzētu būt nē.
As far as I know, most rural power supplies do not have a grounding wire. The main wires of the power grid are usually two wires, zero and hot. The grounding of rural households is generally useless. In general, self-built houses in rural areas basically have no awareness to bury the grounding electrode by themselves. Furthermore, the water and electricity installation of self-built houses in rural areas are done by some electricians, who are not interested in doing grounding, and finally install the grounding electrode by themselves. Ground wire will increase material and labor costs. Standardizing the safe use of electricity in rural areas is a relatively long process.
