Cop requirements main equipotential bonding connected

This preview shows page 23 - 32 out of 32 pages.

COP Requirements Main equipotential bonding connected to Main Earthing Terminal (MET) Supplementary bonding for simultaneously accessible exposed and extraneous conductive parts to maintain the equipotential zone (e.g. 2m) For socket outlets circuit, it must be protected by RCD (having a rated residual current not exceeding 30mA) For circuits supply only fixed equipment within equipotential zone, disconnection within 5 sec. For circuits supply only fixed equipment outside equipotential zone, disconnection within 0.4 sec.
Image of page 23

Subscribe to view the full document.

Control of electrical hazards Electrical hazards can be reduced or eliminated through Physical control Over-current and Short-circuit Protection Devices Grounding Residual Current Devices (RCD) Eg. Residual Current Circuit Breaker (RCCB) or Earth leakage circuit breaker (ELCB)
Image of page 24
Basic Electrical Installation (Live / Neutral?? ) Power supply Protective device fuse or MCB on/off switch Electrical device
Image of page 25

Subscribe to view the full document.

Control of electrical hazards Fuses or circuit breakers be connected in the “live” wire A fuse blows when too much current flows through (above their rating) Rating too low – blowouts too often Rating too high – dangerous current passes
Image of page 26
Electric Wires Ensure Sufficient current carrying capacities Protection from mechanical damage Use New Cable Color Code Phased out in July 07 Wire Flexible Cable Non-Flexible Cable Live Brown Red Neutral Blue Black Earth Green/Yellow Green/Yellow
Image of page 27

Subscribe to view the full document.

New Cable Color Code
Image of page 28
Image of page 29

Subscribe to view the full document.

Image of page 30
Fuse Rating Common fuses for 13A plug: 2A 3A 5A 10A 13A
Image of page 31

Subscribe to view the full document.

Fuse Selection Fuse Rating ( Wattage ÷ Voltage) A 1000W hair dryer should be protected by: 1000W ÷ 220V = 4.5A 5A fuse
Image of page 32

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern