# Commission Delegated Regulation (EU) 2017/654 of 19 December 2016 supplementing Regulation (EU) 2016/1628 of the European Parliament and of the Council with regard to technical and general requirements relating to emission limits and type-approval for internal combustion engines for non-road mobile machinery, Appendix 3

Extent: E+W+S+N.I.

Types of dual-fuel engines operated on natural gas/biomethane or LPG and a liquid fuel — illustration of the definitions and main requirements
Dual-fuel type
GERcycle
Idle on liquid fuel
Warm-up on liquid fuel
Operation on liquid fuel solely
Operation in absence of gas
Comments
1A
GERNRTC, hot ≥ 0,9 or
GERNRSC, ≥ 0,9
NOT allowed
Allowed only on service mode
Allowed only on service mode
Service mode
1B
GERNRTC, hot ≥ 0,9
or
GERNRSC ≥ 0,9
Allowed only on liquid-fuel mode
Allowed only on liquid-fuel mode
Allowed only on liquid-fuel and service modes
Liquid-fuel mode
2A
0,1 < GERNRTC, hot < 0,9
or 0,1 < GERNRSC < 0,9
Allowed
Allowed only on service mode
Allowed only on service mode
Service mode
GERNRTC, hot ≥ 0,9
or
GERNRSC ≥ 0,9
Allowed
2B
0,1 < GERNRTC, hot < 0,9
or 0,1 < GERNRSC < 0,9
Allowed
Allowed
Allowed
Liquid-fuel mode
GERNRTC, hot ≥ 0,9
or
GERNRSC ≥ 0,9
allowed
3A
Neither defined nor allowed
3B
GERNRTC, hot ≤ 0,1
or
GERNRSC ≤ 0,1
Allowed
Allowed
Allowed
Liquid-fuel mode

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Source: https://www.legislation.gov.uk/eur/2017/654/annex/VIII/appendix/3 (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-654/annex-VIII/appendix-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.