On product nameplates, in product literature, and in installation guides, certified products are identified by marks. The marks are obviously different between explosionproof and flameproof since they are based on various categorization systems and Standards.
Explosion-resistant Markings
Based on the Class/Division system, the Explosionproof marks for items that meet North American Standards contain their Class and Division. Both the T-class of the electrical device and the gas group's ignitability are shown by the marking.
Here is an illustration of a Class/Division marking for a product that has been authorized for use in North America by a North American certifying body. The "XP" denotes explosionproof as the chosen mode of protection:
Groups A, B, C, and D of Class I, Division 1; T4 (XP)
Flameproof Labels
Depending on how the certification was obtained (via the IEC or in North America), different goods that meet the standards for Zone system certification display different flameproof marks.
In this example, markings for items with Zone-based certification obtained through IEC are displayed.
Ex db T4 IIC GB
Hazardous location is indicated by the Ex. "db" stands for flameproof. Gas group (II A, B, or C) is referred to by the abbreviation IIC. The T4 stands for temperature class (it might be T1, 2, 3, 4, 5, or 6) and the Gb stands for Zone 1 of the Equipment Protection Label (Zone 0 and Zone 2 are represented by Ga and Gc, respectively).
b) The following example illustrates markings for items whose certification was obtained in the US for use in the US:
Class I, Zone 1, AEx db IIC T4 Gb or Zone 1, AEx db IIC T4 Gb
c) The following example illustrates markings for items whose certification was obtained in Canada and are intended for use in Canada:
Ex db T4 IIC GB
