1. Fuses
Principles of Power Systems by V.K.mehta
Chapter 20
Nouman Ahmad
Electrical Engineering Department
University of Engineering and Technology Lahore
2. Electrical fire
• The most inclusive and direct interpretation of “electrical fire” is a fire involving
some type of electrical failure or malfunction. Any equipment powered by
electricity can have such a failure.
3. Fuse
The fuse element is generally made of materials having low
melting point, high conductivity and least deterioration due to
oxidation
9. Arc Fault Current Interrupter (AFCI)
• is a specific circuit breaker designed to help prevent fires by
detecting an unintended electrical arc and disconnecting the power
before the arc starts a fire.
• An AFCI must distinguish between a harmless arc that occurs
incidental to normal operation of switches, plugs and brushed motors
and an undesirable arc that can occur, for example, in a lamp cord
that has a broken conductor in the cord.
10. Arc Fault Current Interrupter (AFCI)
• An AFCI is selective so that normal arcs do not cause it to trip
• The AFCI circuitry continuously monitors the current and
discriminates between normal and unwanted arcing conditions. Once
an unwanted arcing condition is detected, the AFCI opens its internal
contacts, thus de-energizing the circuit and reducing the potential for
a fire to occur