The use of SY cable is "discouraged" within BS7671:2018+A2 2022 On Site Guide Section 7.9, as generally it is not manufactured to a British or Harmonized standard.
It is not rated for external use or for use in ducts. It's normally classed as a control cable rather than a power cable.
On an EICR it should be recorded as a non-compliance.
It is not rated for external use or for use in ducts. It's normally classed as a control cable rather than a power cable.
On an EICR it should be recorded as a non-compliance.