HOW to check earthing is proper or not

    HOW to check earthing is proper or not?

Effect of Improper Earthing

• Data is transferred as electric waves, which due to earthing this gets distorted.
• Improper grounding causes NOISE in lan.
• More speed means more data in shorter cycles, Which is more prone to effect. (so 1 gbps can have more problem than 100 mbps)
• With Low voltage devices, this problem increases.
• The problem is worsened when the protocol is udp and not tcpip
• Many cisco equipments have grounding LUG (special connector provided by Cisco)

How to measure if earthing is proper (within limits or not)

• Generally in there are three pin plugs. - Phase, Neutral & Earth
• Phase - bottom right -
• Neutral - bottom left.
• Earthing - Top

Checking Earthing - method 1 (old way)

• Get a 100 watts bulb.
• Now put one wire into phase and other in neutral, and check whether it glows or not. (not the intensity of light)
• Now put one wire into phase and other in Earthing, and check whether it glows or not. (not the intensity of light)
• Compare both intensity, if its same - it means earthing is proper.

Checking Earthing - method 2 (new way)

• Use multimeter - set it of 750V AC
• Check Phase + Neutral - (generally it should show 220 V in India)
• Now check Phase + Earthing (note the readings - it should be +/- 5V as compared to reading no. 1) e.g.: 227
• Now check Earthing + Neutral (best is 2 or below, but it should be near 5V) - e.g.: 8
• Total leakage is : (B-A) + C = (227-220) + 8 = 15
• 15 V leakage is a high leakage. Maximum permitted Leakage is 5 V.

J