Standard Test Method for Total Nitrogen in Peat Materials Ingestion-build-221493 this gives a reasonable level

this gives a reasonable level of confidence that the meter type tested is free from serious design errors and material flaws that may prevent it from maintaining its specified accuracy for the period of use estimated by the manufacturer

C62 and C63 appliances with an input not exceeding 300 kW (net CV basis)

This Technical Specification specifies the mandatory and optional information to be recorded in any registry of OIDs

and complete assemblies

BS EN 15594 specifies restoration by electric arc welding and is limited to the head of the rails only

Standard Test Method for Total Nitrogen in Peat Materials Ingestion-build-221493 this gives a reasonable level