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Topic

star A.C. Devices
star A.C. EMI Filter
star A.C. Spectrum
star Digital Oscilloscope
star Flat Top A.C.
star Isolation Transformer - Safer Power Supply ?
star Isolation Transformer
star MCB - For Testing
star Relay - Power Failure Manual Reconnection System
star Soft Start Circuit
star Soft Start Circuit 2
star Tube Amplifier
5Z3P, 6N9P, EL34
 

Useful Info.

star AWG Vs mm
 

My AV System

star System Info.
star Testing Result 2016-5-14
star Testing Result 2014-7-27
   

Case Opening

star Cambridge Audio
CA 351C
star KEF Q300 Speaker
   

Unboxing

star 5z3p 6n9p EL34
Tube Amplifier DIY kit
star AudioQuest USB A-B Forest 1.5m
star B&W 685 S2 speaker
star WireWorld RCA Luna 7 1m
   

Other DIY

star Medeco Lock Replacement
   

 

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A.C. Devices

Fuse

Fuse

  • BS1362 standard - Rated current: 2A - 13A / Breaking Capacity: 6kA
  • One-time Protective Device
MCB
From Left to Right
 
  • Single Pole MCB: Trip Live line only
  • Double Pole MCB, Trip both Live and Neutral line
  • Triple Pole MCB: For Triple Phase Circuit

MCB
Miniature Circuit Breaker

  • Rated current is not more than 100 A
  • Breaking Capacity: M1 - M9 (1kA - 9kA)
  • Trip characteristics are normally not adjustable
MCCB
Similar to MCB, but more robust

MCCB
Moulded Case Circuit Breaker

  • Rated current is up to 1000 A
  • Trip current may be adjustable
RCD

RCD
Residual Current Device

RCCB
Residual Current Circuit Breaker

  • Phase line "L" and Neutral line "N", both wires are connected through RCD.
  • The amount of current flows through the phase (line) should return through neutral.
  • It trips the circuit when there is earth fault current: Current L =/= Current N, difference >30mA
  • Trips within 0.03s
  • RCD does not necessarily require an earth connection itself. However, most RCD has the Functional Earth input because RCD can detect current flowing to earth even the equipment does not being earthed.

RCBO

RCBO

RCBO

RCBO
Residual Circuit Breaker with OverLoad

According to Hong Kong's Code of Practice for the Electricity (Wiring) Regulations (2003 Edition) RCD / RCCB should be used in the Wall Socket circuit.

http://www.emsd.gov.hk/emsd/eng/pps/electricity_pub_cp.shtml