type 1 spd application

newfutile · Aug 22, 2025

i have been tasked with inspecting , reporting and eventually remedial upgrades to our properties that have lightning protection systems.

im aware these need to be placed as near to the origin of the supply as possible.
some of these properties have sub DB,s .

i have added type 1+2 to some already, do the sub DB’s require SPD and if so what type?

PS Electrics · Aug 22, 2025

newfutile said:
i have been tasked with inspecting , reporting and eventually remedial upgrades to our properties that have lightning protection systems.

im aware these need to be placed as near to the origin of the supply as possible.
some of these properties have sub DB,s .

i have added type 1+2 to some already, do the sub DB’s require SPD and if so what type?

This might help

Types of Surge Protective Devices (SPDs) and their use in electrical installations | NICEIC

Section 443 of BS 7671:2018+A2:2022 contains requirements for protection against transient overvoltages either of atmospheric origin or due to switching. Where the application of overvoltage protectio

professional-electrician.com

Don't have regs book to hand but it says 534.2 has the diagram of where the various SPDs go.

So on Sub boards Type 2 or Type 3 may be used in Industrial applications.