Quote from: westom on February 02, 2018, 04:15:30 PM

Quote from: Mandeep148 on February 02, 2018, 02:57:47 PM

UPDATE1.
i saw his farm, he was using SINEWAVE UPS 2000VA for every RIG, from more than a year..

You have protection from a blackout. So that unsaved data can be saved. Transient and spike protection is still not installed. Anyone can read specification numbers on that UPS. It does not claim to protect from surges.

UPS is protection when AC voltage drops from 230 down to zero. Surge protection is when AC voltage spikes well exceed 700 volts. Protection from that anomaly must be located at the service entrance with (this is most critical) a low impedance (ie less than 3 meter) connection to earth ground. Earth ground is not wall receptacle safety ground. Earth ground is electrodes in earth.

Surges that do damage are rare - maybe once every seven years. A number that can vary significantly even in the same town. Geology is one relevant risk factor.

No plug-in protector claims effective protection. Read its spec numbers. Protection provide by a UPS is even less. For well over 100 years, facilities that cannot have damage always properly earth the 'whole house' solution. Then everything (not just miners) are protected. A protector is only as effective as its earth ground.

i agree with you i respect for that detailed reply that really give person knowledge about protection..
the sinewave UPS im using, it is popular for Surge protector, MCB works well in that JOB, i also installed surge protector facility in whole home..
i also have facility of 12 feet long earthing, but stiill i would be more safe to use surge protector,
is that surge protector giving safety for like you said 700 volt?
https://www.amazon.in/Belkin-Essential-F9E600zb2MGRY-6-Socket-Protector/dp/B007T5S0G0/ref=sr_1_3?ie=UTF8&qid=1517592410&sr=8-3&keywords=surge+protector

https://www.amazon.in/APC-P4U2-4-Socket-Surge-Protector/dp/B00YC3QXFC/ref=sr_1_4?ie=UTF8&qid=1517592432&sr=8-4&keywords=apc+surge+protector

please if you dont mind, please suggest me good surge protector in amazon.in (buying from .com would take more time)