The 18th ed regs (443.4) say you must fit an SPD in some circumstances (e.g. where overvoltage could cause injury), otherwise you may skip a single dwelling where nothing much of value would be lost, otherwise you must fit one unless you can show via the calculation in 443.5 that it's not needed.
If the customer refuses when the regs say you must, then that's a non-conformity to be listed on the EIC.
The 18th ed regs (443.4) say you must fit an SPD in some circumstances (e.g. where overvoltage could cause injury), otherwise you may skip a single dwelling where nothing much of value would be lost, otherwise you must fit one unless you can show via the calculation in 443.5 that it's not needed.
If the customer refuses when the regs say you must, then that's a non-conformity to be listed on the EIC.
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