Class I may refer to:
- Class I antiarrhythmic
- Class I electrical appliance, a device constructed according to electrical grounding specifications in the IEC 60536-2 standard
- Class I bacteriocin, a type of toxin produced by some bacteria
- Class I biosafety cabinet
- Class I laser, a type of eye-safe laser defined in the ANSI Z136 standard
- Class I rail carrier, a type of major freight railroad company in Canada
- Class I railroad, a type of major freight railroad company in the United States
See also
Topics referred to by the same term
This disambiguation page lists articles associated with the title Class I.If an internal link led you here, you may wish to change the link to point directly to the intended article. Category: