Some countries have adopted IEC 60099-5 as a national standard. For example:
The standard applies specifically to with and without gaps for AC systems. iec 600995 pdf
standard, published by the International Electrotechnical Commission, serves as the primary global guide for the selection and application of surge arresters in three-phase systems with nominal voltages above 1 kV. Scope and Technical Application Some countries have adopted IEC 60099-5 as a