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What is differences between a double insulated appliance and an earthed appliance?
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Should double insulated appliances ever be earthed?
There is no need to. The manufacturer designed the appliance for the specification of not needing a ground to be connected to it.
Are double Insulated portable tools earthed?
No.
What type appliance must not be earthed?
An electric stove
Why are hair dryers not earthed?
Things that aren't grounded, like hair dryers, are double insulated. If the hair dryer gets a short circuit, the two layers of insulation will protect you. Hair dryers also have a ground-fault circuit interrupter plug that protects you if you drop the appliance in water.
Can delta connection be used on 3 phase 4 wire system?
A delta connected appliance can be connected to a 3-phase system by leaving the neutral unconnected. The appliance must be properly earthed.
What do you do with a green wire that is not connected to the last smoke alarm in the hard wire system?
Fold it back on itself and tape it up. Smoke alarms are double insulated (no exposed conductive parts) and aren't required to be earthed.
When was Earthed to the Ground created?
Earthed to the Ground was created in 1984-05.
Difference between earthed and unearthed cable?
For earthed and un earthed XLPE cables, the IS 7098 part2 1985 does not give any difference in specification. The insulation level for cable for unearthed system has to be more. In simple statement the manufacturers states that 11 KV earthed cable is suitable for use in 6.6 KV unearthed system.The process of manufacture of cable is same. The size of cable will depend on current rating and voltage level.
What protects you from getting a shock when you touch a live wire?
The earth to the appliance or special insulation, commonly called double insulated, or an isolating transformer or an RCD (Residual Current Device).For more information see the answer to the Related question shown below.
Can insulator be earthed?
yes
What is the power line voltage between phase and earthing?
It is the same as phase to neutral. As the neutral is earthed at the electricity suppliers transformer.
Why is an insulated ground wire used in a 3 phase 4 wire system?
A three-phase 4-wire system has three live wires and a neutral, which is earthed at at least one point at the transformer. All current-carrying wires are insulated in this system, for safety. The voltage on the neutral might be zero or only a volt or two, but under fault conditions its voltage could be much higher.
