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Circuit Protection

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Live Electrical IS4N-20 Timeguard Weathersafe Rotary Isolator Switch – 4 Pole 20A

Timeguard IS4N-20 4 Pole 20A Rotary Isolator Switch

7 In stock
This item cannot be back-ordered
SKU: IS4N-20
£10.90
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FuseBox TPN07FBX Fusebox TPN07FBX 7 Way 125A Three Phase Board 1FuseBox TPN07FBX Fusebox TPN07FBX 7 Way 125A Three Phase Board 2

Fusebox TPN07FBX 7 Way 125A Three Phase Board

1 In stock
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SKU: TPN07FBX
£219.40
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FuseBox MT10C101 FuseBox MT10C101 10A Single Pole 10kA C Curve MCB

FuseBox MT10C101 10A Single Pole 10kA C Curve MCB

8 In stock
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SKU: MT10C101
£3.22
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Live Electrical RNA40B-030 RCBO A Type DP Bi-Directional 40A B Curve 30mA

Live Electrical RNA40B-030 RCBO A Type DP Bi-Directional 40A B Curve 30mA

15 In stock
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SKU: RNA40B-030
£16.06
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Live Electrical CB350C Live Electrical CB350C 3 Pole 50A C Curve 10kA MCB 1Live Electrical CB350C Live Electrical CB350C 3 Pole 50A C Curve 10kA MCB 2

Live Electrical CB350C 3 Pole 50A C Curve 10kA MCB

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SKU: CB350C
£10.99
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Live Electrical CB363D Live Electrical CB363D 3 Pole 63A D Curve 10kA MCB 1Live Electrical CB363D Live Electrical CB363D 3 Pole 63A D Curve 10kA MCB 2

Live Electrical CB363D 3 Pole 63A D Curve 10kA MCB

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SKU: CB363D
£10.99
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FuseBox F2021M FuseBox F2021M 21 Way RCBO Consumer Unit 1

FuseBox F2021M 21 Way RCBO Consumer Unit

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SKU: F2021M
£48.90
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FuseBox MT06B631 FuseBox MT06B631 63A MCB Curve B 1

FuseBox MT06B631 63A MCB Curve B

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SKU: MT06B631
£2.90
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WCED WME06/SP WCED 3 Way SPD Metal Consumer Unit

WCED 3 Way SPD Metal Consumer Unit

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SKU: WME06/SP
£37.01
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WCED WME18/SP WCED 15 Way SPD Metal Consumer Unit

WCED 15 Way SPD Metal Consumer Unit

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SKU: WME18/SP
£53.75
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WCED WAC4P40 WCED 4 Pole 40A 4NO AC Contactor 1

WCED 4 Pole 230/400V 40A NO Normally Open AC Modular Contactor

9 In stock
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SKU: WAC4P40
£14.99

3-£14.62£0.37£14.99
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20-£13.49£1.50£14.99
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FuseBox MT10B061 FuseBox MT10B061 6A Single Pole 10kA B Curve MCB

FuseBox MT10B061 6A Single Pole 10kA B Curve MCB

18 In stock
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SKU: MT10B061
£3.22
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FuseBox MT10B161 FuseBox MT10B161 16A Single Pole 10kA B Curve MCB

FuseBox MT10B161 16A Single Pole 10kA B Curve MCB

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SKU: MT10B161
£3.22
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FuseBox MT10C102 FuseBox MT10C102 10A Double Pole 10kA C Curve MCB

FuseBox MT10C102 10A Double Pole 10kA C Curve MCB

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SKU: MT10C102
£6.68
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FuseBox RTA0630304 Fusebox RTA0630304 63A 4 Pole 30MA Type A RCD

Fusebox RTA0630304 63A 4 Pole 30mA Type A RCD

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SKU: RTA0630304
£23.50
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WCED WKC110C 10kA 1 Pole MCB Curve C 10A

WCED WKC110C 10kA 1 Pole MCB Curve C 10A

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SKU: WKC110C
£2.65

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Hager VML120 20 Way RCBO Consumer Unit

Hager VML120 20 Way RCBO Consumer Unit

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SKU: VML120
£66.79
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Live Electrical RC140C-030 Live 30mA 40A RCBO 10kA Curve C Type AC 1Live Electrical RC140C-030 Live 30mA 40A RCBO 10kA Curve C Type AC 2

Live 30mA 40A RCBO 10kA Curve C Type AC

9 In stock
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SKU: RC140C-030
£10.99 £5.99
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Live Electrical RI463 63A Weatherproof Rotary Isolator Switch 4 Pole 1Live Electrical RI463 63A Weatherproof Rotary Isolator Switch 4 Pole 2

Live Electrical RI463 4 Pole 63A IP65 Rotary Isolator Switch

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SKU: RI463
£17.99
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WCED WAR240-030 WCED 2 Pole 40A 30mA Type A High Immunity RCD

WCED WAR240-030 2 Pole 40A 30mA Type A High Immunity RCD

2 In stock
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SKU: WAR240-030
£16.17

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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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