EWRB MCBs EXAM THEARY STUDY GUIDE QUESTIONS AND ANSWERS

EWRB (MCBs) EXAM THEARY STUDY GUIDE
QUESTIONS AND ANSWERS.
PowerPoints MCB
✔✔32/20C for PowerPoints and appliances, e.g. lounges
bathrooms MCB
✔✔16/10A, only for lighting, fan and heated towel rail
MCB types
✔✔A, 2-3x, LEDs
B, 3-5x, 13 sec TT, standard domestic, PP, lighting,
C, 5-10x, 5 sec TT, comm. kitchens, fans, motors, ovens, fluorescent
lighting, etc
D, 10-20x, UPS systems, plant equipment, heavy machinery, welders,
motors etc.
DIN rail size is
✔✔35mm
standard domestic supply voltage
✔✔230V
maximum MCBs under 1 RCD?
✔✔3x CB / RCD unit
types of MCB trips
✔✔thermal