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Live Electrical TPN18-125 Live Electrical TPN18-125 125A 18 Way TPN Distribution Board 1Live Electrical TPN18-125 Live Electrical TPN18-125 125A 18 Way TPN Distribution Board 2

Live Electrical TPN18-125 125A 18 Way TPN Distribution Board

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Live Electrical CB306D Live Electrical CB306D 3 Pole 6A D Curve 10kA MCB 1Live Electrical CB306D Live Electrical CB306D 3 Pole 6A D Curve 10kA MCB 2

Live Electrical CB306D 3 Pole 6A D Curve 10kA MCB

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Live Electrical CB150D Live Electrical CB150D 50A Curve D 10kA MCB 1Live Electrical CB150D Live Electrical CB150D 50A Curve D 10kA MCB 2

Live Electrical CB150D 50A Curve D 10kA MCB

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Live Electrical CB163D Live Electrical CB163D 63A Curve D 10kA MCB 1Live Electrical CB163D Live Electrical CB163D 63A Curve D 10kA MCB 2

Live Electrical CB163D 63A Curve D 10kA MCB

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Hager VML910CUSPDRK Hager VML910CUSPDRK SPD Dual RCD 10 Way Consumer Unit 1

Hager VML910CUSPDRK SPD Dual RCD 10 Way Consumer Unit

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Hager VML11414 Hager VML11414 Dual Row 14+14 Way Main Switch Consumer Unit

Hager VML11414 Dual Row 14+14 Way Main Switch Consumer Unit

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Hager VML12020 Hager VML12020 Dual Row 20+20 Way Main Switch Consumer Unit

Hager VML12020 Dual Row 20+20 Way Main Switch Consumer Unit

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Hager VML11010 Hager VML11010 Dual Row 10+10 Way Main Switch Consumer Unit

Hager VML11010 Dual Row 10+10 Way Main Switch Consumer Unit

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Hager VMLF110 Hager VMLF110 10 Way Main Switch Flush Consumer Unit

Hager VMLF110 10 Way Main Switch Flush Consumer Unit

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Hager NBN306A Triple MCB

Hager NBN332A 3 Pole MCB Type B 32A 10kA

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Hager NBN306A Triple MCB

Hager NBN340A 3 Pole Type B MCB 40A 10kA

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Hager NBN306A Triple MCB

Hager NBN350A 3 Pole MCB Type B 50A 10kA

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Hager NCN306 MCB

Hager NCN363A 3 Pole MCB Type C 63A 10kA

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Hager NDN316A 3 Pole MCB Type D 16A 10kA

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Hager NDN340A 3 Pole MCB Type D 40A 10kA

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Hager NCN150A Hager NCN150A Single Pole Type C MCB 50A 10kA

Hager NCN150A Single Pole Type C MCB 50A 10kA

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Hager NDN125A Hager NDN125A Single Pole Type D MCB 25A 10kA

Hager NDN125A Single Pole Type D MCB 25A 10kA

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Hager NBN163A Hager NBN163A Single Pole Type B MCB 63A 10kA

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Hager NBN150A Hager NBN150A Single Pole Type B MCB 50A 10kA

Hager NBN150A Single Pole Type B MCB 50A 10kA

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Circuit protection in the UK is governed by the wiring regulations outlined in the British Standard BS 7671. This standard, also known as the IET Wiring Regulations, sets out the requirements for the design, installation, and maintenance of electrical installations in the UK. Circuit protection is a crucial aspect of electrical installations to ensure the safety of people and property.

Here are some key aspects of circuit protection according to BS 7671 and the devices commonly used in the UK market:

  1. Circuit Breakers: Circuit breakers are essential devices for protecting electrical circuits. BS 7671 specifies requirements for the selection and installation of circuit breakers. They come in various types, including:
    • Miniature Circuit Breakers (MCBs): MCBs are commonly used to protect individual circuits. They trip when there’s an overload or a short circuit.
    • Residual Current Devices (RCDs): RCDs are designed to protect against electric shock. They disconnect the circuit if they detect an imbalance in current, indicating a fault.
    • Combination RCD/MCB Devices: These devices combine the functions of both MCBs and RCDs in a single unit. They are often used for socket outlets.
  2. Fuses: While less common in modern installations, fuses may still be used for circuit protection. They work by melting when there’s an excess current, breaking the circuit.
  3. Overcurrent Protection: BS 7671 requires that circuits are protected against overcurrents. This is typically achieved through the use of circuit breakers, fuses, or other protective devices.
  4. Earthing and Bonding: Proper earthing and bonding are essential for safety. This ensures that in the event of a fault, the fault current is safely directed away from people and property.
  5. Surge Protection: Surge protection devices may be required to protect against voltage surges or lightning strikes, especially for sensitive electronic equipment.
  6. Arc Fault Detection: In certain installations, arc fault detection devices may be used to detect and disconnect circuits in the presence of dangerous arc faults.
  7. Circuit Isolation: BS 7671 also specifies requirements for circuit isolation devices such as switches and isolators.
  8. Cable Sizing: The standard provides guidelines for selecting the correct cable size to ensure that the cables can safely carry the intended load without overheating.
  9. Circuit Labels and Documentation: Proper labeling and documentation of circuits are important for maintenance and safety. BS 7671 outlines requirements for labeling and record-keeping.

It’s important to note that regulations and standards may be updated over time, so it’s essential to consult the latest version of BS 7671 and any local regulations or codes that may apply to your specific location or type of installation. Additionally, electrical work should be carried out by qualified and competent electricians to ensure compliance with safety standards.

 

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