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EWRB theory prep – MCBs EXAM well updated 2024 with questions and correct answers $19.99   Add to cart

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EWRB theory prep – MCBs EXAM well updated 2024 with questions and correct answers

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EWRB theory prep – MCBs EXAM well updated 2024 with questions and correct answers circuit breaker purpose - CORRECT ANSWERdetect SC/OL and break contact on fault detection at short circuit, PSCC fault occurs, what operating mechanism is used - CORRECT ANSWERmagnetic field two opera...

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  • October 5, 2024
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  • EWRB theory prep – MCBs well updated 2024 wit
  • EWRB theory prep – MCBs well updated 2024 wit
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janetheuri
EWRB theory prep – MCBs EXAM well updated 2024
with questions and correct answers



circuit breaker purpose - CORRECT ANSWERdetect SC/OL and break contact on fault
detection

at short circuit, PSCC fault occurs, what operating mechanism is used - CORRECT
ANSWERmagnetic field

two operating mech. of MCB is - CORRECT ANSWERmagnetic and thermal

bedroom lighting MCB - CORRECT ANSWER16C for bedroom lighting

powerpoints MCB - CORRECT ANSWER32/20C for powerpoints and appliances, e.g.
lounges

bathrooms MCB - CORRECT ANSWER16/10A, only for lighting, fan and heated towel
rail

MCB types - CORRECT ANSWERA, 2-3x, LEDs
B, 3-5x, 13 sec TT, standard domestic, PP, lighting,
C, 5-10x, 5 sec TT, comm. kitchens, fans, motors, ovens, flourescent lighting, etc
D, 10-20x, UPS systems, plant equipment, heavy machinery, welders, motors etc.

DIN rail size is - CORRECT ANSWER35mm

standard domestic supply voltage - CORRECT ANSWER230V

maximum MCBs under 1 RCD? - CORRECT ANSWER3x CB / RCD unit
types of MCB trips - CORRECT ANSWERthermal
magnetic

thermal tripping - CORRECT ANSWERbi-metal strip, used for overload currents
protection

magnetic tripping - CORRECT ANSWERmagnetic inductor, used for short circuit
protection

reset procedure - CORRECT ANSWERreset to OFF
reset to ON

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