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This document specifies the requirements for the design and construction of equipment, intended for use in potentially explosive atmospheres, protected by the type of protection: Control of ignition source "b". This document supplements the requirements in EN 13463-1, the contents of which also apply in full to equipment constructed in accordance with this document. Equipment conforming with the relevant clauses of this document meet the requirements for the following categories: - Equipment Group I Category M2 - that does not contain an ignition source arising from severe operating conditions, in particular arising from rough handling and changing environmental conditions in mines; - Equipment Group II category 3 - that does not contain an ignition source in normal operation; - Equipment Group II category 2G or 2D - that does not contain an ignition source arising as a result of foreseeable malfunctions; - Equipment Group II category 1G or 1D - that does not contain an ignition source in normal operation, or under foreseeable malfunctions, or under rare malfunctions. This type of protection can be used to produce category 3 equipment which otherwise would have an ignition source in normal operation, i.e. it is not able to conform with EN 13463-1 The type of ignition protection described in the standard can be used either on its own or in combination with other types of ignition protection to meet the requirements for equipment of Group I category M2, or Group II categories 1, 2 and 3 depending on the ignition hazard assessment in EN 13463-1. This document does not apply to: - control devices which are not intended to provide ignition protection; - the ignition protection of electrical equipment; - equipment shut down systems, initiated by flammable gas detectors, explosive atmosphere detectors, carbon monoxide, fire, or smoke detectors.