50 Hz – 1500rpm
| Engine brand | Engine country of manufacture | MIN “Prime” size | MIN “Standby” size | MAX “Prime” size | MAX “Standby” size |
| CUMMINS | USA | 16 | 18 | – | 1500 |
| FOTON (ISUZU) | JAPAN | 20 | 24 | 32 | 36 |
| PERKINS (CATERPILLAR) | UK | 7 | 8 | 1800 | 2000 |
| DEUTA (DEUTZ) | GERMANY | 16 | 18 | 600 | 660 |
| DOOSAN | KOREA | 120 | 132 | 600 | 660 |
| YTO | CHINA | 8 | 8.8 | 32 | 35.2 |
| YUCHAI | CHINA | 16 | 18 | 2200 | 2420 |
| SDEC | CHINA | 50 | 55 | 728 | 800 |
| SME (SDEC+MITSUBISHI) | CHINA | 500 | 560 | 1600 | 1760 |
| FAWDE | CHINA | 12 | 13.2 | 40 | 44 |
| WEICHAI | CHINA | 24 | 28 | 150 | 160 |
60 Hz – 1800rpm
| Engine brand | Engine country of manufacture | MIN “Prime” size | MIN “Standby” size | MAX “Prime” size | MAX “Standby” size |
| CUMMINS | USA | 20 | 22 | 1260 | 1386 |
| FOTON (ISUZU) | JAPAN | 20 | 24 | 36 | 40 |
| PERKINS (CATERPILLAR) | UK | 9 | 10 | 12350 | 1485 |
| DEUTA (DEUTZ) | GERMANY | 20 | 24 | 600 | 660 |
| DOOSAN | KOREA | 144 | 160 | 680 | 748 |
| YTO | CHINA | 8 | 8.8 | 36 | 40 |
| YUCHAI | CHINA | 36 | 40 | 400 | 440 |
| SDEC | CHINA | 50 | 55 | 300 | 336 |
| SME (SDEC+MITSUBISHI) | CHINA | – | – | – | – |
| FAWDE | CHINA | 15 | 18 | 48 | 52 |
| WEICHAI | CHINA | 28 | 32 | 160 | 176 |