Personal safety from power, Electrical Engineering

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.

Posted Date: 9/29/2012 8:18:03 AM | Location : United States







Related Discussions:- Personal safety from power, Assignment Help, Ask Question on Personal safety from power, Get Answer, Expert's Help, Personal safety from power Discussions

Write discussion on Personal safety from power
Your posts are moderated
Related Questions
Q. Explain the Importance of distributing frames? Basically four levels of cabling are used as displayed in Figure. At the subscriber end, drop wires are taken to a distributio

Q. Given the block diagram and the truth table of a demultiplexer, as shown in Figure, obtain its implementation.

Consider and obtain the values for R S , R 2 , R 1 , and R D . Apply the rule-of-thumb dc design procedure outlined in this section for a JFET with V P = 3V, I DSS = 20 mA, and a

Let ω = 2π × 60 rad/s corresponding to a frequency of 60 Hz. (a) Consider v(t) = 100 √2 cos(ωt + 30°) V and i(t) = 10 √2 sin(ωt + 30°) A. Find the corresponding phasors ¯V and ¯

List the uses of USART. USART- Universal Synchronous Asynchronous Receiver-Transmitters. It is used to transmit and receive the data in serial communication mode. It is

Q. A four-pole dc machine with 728 active conductors and 30mWb flux per pole runs at 1800 r/min. (a) If the armature winding is lap wound, find the voltage induced in the armatu

Electricity Policies: The National Electricity Policy is a main policy instrument having the force of law under the Electricity Act, 2003. The Central and State Electricity Re

Q. Explain common collector configuration? It is called the common-collector configuration because (ignoring the power supply battery) both the signal source and the load share

Q. For the low-pass filter configuration of Figure, with R i = R f = 1M, calculate C f such that the 3-dB point is at 1 kHz.

(1) An argon ion laser, emitting light at a wavelength of 488nm with a beam divergence of 150 firad, is used to illuminate the moon. (i) Assuming the earth-to-moon distance is 3