Horizontal vs Vertical Testing
Cable insulation is typically tested vertically. R118 Annex 8 specifies the exact flame application time and required self-extinguishing properties.
Common Mistakes
Testing single cables when the application involves bundles. Bundle mass significantly alters the thermal mass and flame propagation.
FAQ
Q: Does R118 apply to exterior HV cables?
A: It primarily applies to interior compartments (buses/coaches), but OEMs increasingly push R118 compliance to all internal cabin wiring.