NC — Not U.S. EPA Marine Certified for use in the U.S. or Canada.
T3C — Meets U.S. EPA Marine Tier 3 Commercial standards
T3R — Meets U.S. EPA Marine Tier 3 Recreational standards
T3CR — Meets U.S. EPA Marine Tier 3 Commercial standards and U.S. EPA Marine Tier 3 Recreational standards
T4C — Meets U.S. EPA Marine Tier 4 Final Commercial standards
As of January 1, 2016 Category 2 engines (7 to 30 l/cylinder) on Canadian flagged vessels must meet U.S. EPA requirements or have an equivalent certificate that has been provided by another country. All other marine engines must meet IMO requirements for vessels constructed after December 31, 2010.
IMOI — Meet IMO emissions standards for the year 2000 as defined by Regulation 13 of Annex VI to the International Convention for the Prevention of Pollution from Ships, 1973, as modified by the protocol of 1997. Applies to specific engines in vessels with a keel lay date from Jan. 1, 2000 until Dec. 31, 2010; other rules may apply.
IMOII — Emissions data measurement is consistent with the procedures described in the NOx Technical Code 2008. The engine exhaust emissions meet the International Maritime Organization’s Regulation 13 of Revised Annex VI to the MARPOL Convention. Applies to engines greater than 130 kW on vessels flagged in countries party to the MARPOL Annex VI Convention and the vessel is constructed after Dec 31, 2010. IMO II typically applies outside of NOx Emissions Control Areas (NOx ECA). See IMO.org “status of conventions” for a current list of nations enforcing MARPOL Annex VI. Other rules may apply.
IMOIII — Emissions data measurement is consistent with the procedures described in the NOx Technical Code 2008. The engine exhaust emissions meet the International Maritime Organization’s Regulation 13 of Revised Annex VI to the MARPOL Convention. IMOIII applies to NOx Emission Control Areas (NOx ECA) defined areas. Other rules may apply.
NST — Engines < 130 bkW are not subject to IMO regulations
Commercial Craft Directive 97/68/EC (EU Stage IIIA)
This directive is in effect and applies to all propulsion and auxiliary engines. Caterpillar has certified some engines with a rated power of greater than 560 bkW to this standard. Most of these are to be used for inland waterway vessels. These engines also became effective by reciprocity agreement with CCNR Stage II, on July 1, 2007.
Central Commission for Navigation on the Rhine
Commercial Craft — CCNR Stage II diesel engine emissions limits became effective July 1, 2007; this Directive applies to engines with a rated power at or above 37 kW.
Engine Certification Descriptions
CC2 — Meets CCNR Stage II
IW — Meets EU Stage IIIA or referred to as, Inland Waterway Commercial Craft Directive, meaning the same as Commercial Craft Directive 97/68/EC (EU Stage IIIA)
NC — Not Certified for specific regulations.
NST — Engines < 19 kW are not subject to CCNR legislation.
RCD — Recreational Craft Directive, meets EU 94/25/EC. This directive is in effect and applies to all recreational engines used in the European Union areas.