21 What is the single most important part of an over- of an over-voltage protect

Question

21 What is the single most important part of an over- of an over-voltage protection What is the best way to protect low voltage appliances ik from over-voltages? way to protect low voltage appliances like computers 23 over voltage protection device consisting of a bare copper wire ending from the top of a building, tree or tall ship to a ground rod is called a 24 What magnitude of ground resistance is considered very ood? 25 Name two w ays the ground rod resistance can usually be improved 26 To measure AC currents greater than 10 amp. (the limit of a volt-ohnm can be used with a 0 to 5 meter), a amp. ammeter. 27 To measure DC currents greater than 10 amp. (the limit of a volt-ohm meter), a 50mV voltmeter. can be used with a 0 to To measure AC voltage greater than 1000 volts (the limit of a volt- can be used with a 0 to 28 ohm meter), a 120 volt voltmeter 29 Any time when we find that the voltage at loads is not adequate, what four design options should we consider to increase the voltage? 30 When the normal electric power source to your house is out (doesn't work), what first step must be performed before connecting a portable generator to the electric power system of your house.

Explanation / Answer

1).lightining arrester acts as nonlinear resistor and provides low impedance path for lightening voltage.

2).uses stabilizers

3).guard wire or earth wire

4).5 ohms are less

5).increasing the length of rod , use multiple rods decreases the ground resistance

6).shunt resistance of low value ,less than internal resistance

7).shunt resistance across voltmeter

8).series resistor or reactance with voltmeter

9).shunt capacitor connected across load, condenser across load and series capacitance to reduce impedance of line so voltage improves ,tapchanging transformer across load

10).generator should not be connected directly to breaker box without transfer switch

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