18th Edition18th Edition 18th Edition
18th Edition 18th Edition
Scenario 1 Scenario 1
Scenario 1
Surge protection must be provided
Surge protection must be provided where overvoltage could: - Cause serious injury/loss of life - Cause interruption of public services - Cause damage to cultural heritage
Surge protection must be provided
- Cause interruption to commerical/ industrial activity
- Cause interruption to commerical/ industrial activity
- Affect a large number of co-located individuals
- Affect a large number of co-located individuals
Mandatory to fit protection devices against transient voltages
Mandatory to fit protection devices against transient voltages
Mandatory to fit protection devices against transient voltages
Surge protection must be provided where overvoltage could: - Cause serious injury/loss of life - Cause interruption of public services - Cause damage to cultural heritage
- Cause interruption to commerical/ industrial activity
- Affect a large number of co-located individuals
Surge Protection must be provided
Surge protection must be provided where overvoltage could: - Cause serious injury/loss of life - Cause interruption of public services - Cause damage to cultural heritage
Decision Tree clause number 443.4clause number 443.4
clause number 443.4
Decision Tree Decision Tree
18th Edition
Scenario 2 All other cases
Scenario 2 All other cases
Scenario 2 All other cases
A risk assessment must be performed to determine if surge protection is needed
If no risk assessment is carried out surge protection must be provided
If no risk assessment is carried out surge protection must be provided
If no risk assessment is carried out surge protection must be provided
If a risk assessment is carried out:
If a risk assessment is carried out:
A. Risk assessment valuation more than 1000, no need for surge protection
A. Risk assessment valuation more than 1000, no need for surge protection
B. Risk level evaluation less than 1000, surge protection must be fitted
B. Risk level evaluation less than 1000, surge protection must be fitted
protection against transient overvoltages where required by section 443. protection against transient overvoltages where required by section 443. See section 534 of BS 7671 to establish the selection of SPD’s for
See Section 534 of BS 7671 to establish the selection of SPD’s for See section 534 of BS 7671 to establish the selection of SPD’s for
For more information contact Sales on: Tel: 01952 238 100 Email:
sales@bgelectrical.co.uk Web:
www.bgelectrical.co.uk BG Electrical Ltd. Stafford Park 1, Telford, Shropshire TF3 3BD.
For more information contact Sales on: Tel: 01952 238 100 Email:
sales@bgelectrical.co.uk Web:
www.bgelectrical.co.uk BG Electrical Ltd. Stafford Park 1, Telford, Shropshire TF3 3BD.
For more information contact Sales on: Tel: 01952 238 100 Email:
sales@bgelectrical.co.uk Web:
www.bgelectrical.co.uk BG Electrical Ltd. Stafford Park 1, Telford, Shropshire TF3 3BD.
protection against transient overvoltages where required by section 443.
BG is a registered trademark and member of the Luceco plc group of companies. BG is a registered trademark and member of the Luceco plc group of companies.
Email:
sales@bgelectrical.co.uk www.bgelectrical.uk BG is a registered trademark and member of the Luceco plc group of companies. 39
B. Risk level evaluation less than 1000, surge protection must be fitted
A. Risk assessment valuation more than 1000, no need for surge protection
If a risk assessment is carried out:
Installed value does not warrant surge protection - no need to fit
Installed value does not warrant surge protection - no need to fit
Installed value does not warrant surge protection - no need to fit
Installed value warrants
Installed value warrants
Installed value warrants
surge protection surge protection
surge protection
A risk assessment must be performed to determine if surge protection is needed
A risk assessment must be performed to determine if surge protection is needed
Scenario 3 Scenario 3
Scenario 3
With the exception of single dwelling (domestic) units
With the exception of single dwelling (domestic) units
With the exception of single dwelling (domestic) units
Surge Protection may be required in single dwelling (domestic) units:
Surge Protection may be required in single dwelling (domestic) units:
Surge Protection may be required in single dwelling (domestic) units:
A. Designer/installer establishes what the customer requires.
A. Designer/installer establishes what the customer requires.
A. Designer/installer establishes what the customer requires.
B. They look at the perceived value of the installation and equipment within the dwelling
B. They look at the perceived value of the installation and equipment within the dwelling
B. They look at the perceived value of the installation and equipment within the dwelling
IET Wiring Regulations IET Wiring Regulations
IET Wiring Regulations
Requirements for overvoltage protection BS 7671:2018 Requirements for overvoltage protection BS 7671:2018 Requirements for overvoltage protection BS 7671:2018
Requirements for overvoltage protection BS 7671:2018 Requirements for overvoltage protection BS 7671:2018
Requirements for overvoltage protection BS 7671:2018
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