Personal safety from power, Electrical Engineering

Assignment Help:

Personal  safety

Power supplies can be very dangerous. This is specifically true of high voltage circuits, but anything over 12 V must be treated as lethal potentially.

A power supply is not safe after it has been switched off. Filter capacitors can hold charge for the long time. In the high voltage supplies of good design, bleeder resistors of a high ohmic value are connected across each filter capacitor, so that capacitors will discharge in few minutes after supply is turned off. But do not bet your life on components which might not be there, and that can and do sometimes fail.

1481_personal saftey by power.png 
Figure--   A bleeder resistor, R, allows filter capacitors to discharge when a supply is shut off.

Most of the manufacturers supply safety instructions with equipment carrying hazardous voltages. But do not assume something is safe only because dangers are not mentioned in instructions.


Related Discussions:- Personal safety from power

How an electroscope charged without contacting charged body, An electroscop...

An electroscope charged WITHOUT contacting a charged body is charged by: a) Induction b) Conduction c) Convection d) Insulation Ans: An electroscope char

Use delta-wye transformation for network reduction, 1555_Use delta-wye tran...

1555_Use delta-wye transformation for network reduction.png what is the solution to this particular problem?

Calculate the maximum analog output voltage, Q. For the 4-bit D/A converter...

Q. For the 4-bit D/A converter of Figure, calculate: (a) The maximum analog output voltage. (b) The minimum analog output voltage. (c) The smallest detectable analog outpu

Electrons, Ask question #Minimum 100 words accepted how does the charge pla...

Ask question #Minimum 100 words accepted how does the charge plate relate to the movement of electrons

What do you mean by time consistent busy hour, Q. What do you mean by Time ...

Q. What do you mean by Time consistent Busy Hour? (i) Busy Hour (ii) Peak Busy Hour (iv) Time consistent Busy Hour  (v) Traffic intensity Ans: (i)  Busy Hour: C

State the principle of operation of a capacitor, a. Describe why a three-ph...

a. Describe why a three-phase induction motor rotates always with a speed less than the synchronous speed. b. State the principle of operation of a capacitor start single-phase

Ac generators - the alternator, In practice, it is usually better to wind t...

In practice, it is usually better to wind the field coils on the rotor and supply the field current to them via slip rings.  As the rotor turns, the changing magnetic field expe

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd