Rules define a sport and Endurance is no different
ESNZ Constitution
ESNZ's governing document (Aug 2014)
ESNZ General & Veterinary Regulations
The GRs apply to all ESNZ's sporting competitions
Endurance By-Law
The governing document of ESNZ Endurance (Aug 2010)
Endurance Discipline Rules
National Rules of Endurance - Version 13, Updated 9th December 2017