What does permissible mean

What does permissible mean

• A. Refers to a device approved by U.S. Bureau of Mines, or MSHS meeting all restrictions, limitations, etc. by the agency.
• B. A device that can be used without any agency approval.
• C. A device rated for any voltage without restrictions.
• D. A device manufactured outside the United States.

Answer: (A)

In mining electrical safety, a device is permissible when it has been officially approved by the appropriate safety authority (MSHA or its predecessor, the U.S. Bureau of Mines) and is used only under the restrictions, limitations, and tolerances specified in that approval. This approval process confirms the equipment is designed to operate safely in the harsh mine environment, including the presence of hazardous gases or heavy dust, and will not become an ignition source. So, a permissible device isn’t about just being functional or having a broad voltage rating; it has to carry an approved status and be used within the defined conditions. Devices without that agency approval, or used outside the approved limitations (or outside the required environment), are not permissible.

In mining electrical safety, a device is permissible when it has been officially approved by the appropriate safety authority (MSHA or its predecessor, the U.S. Bureau of Mines) and is used only under the restrictions, limitations, and tolerances specified in that approval. This approval process confirms the equipment is designed to operate safely in the harsh mine environment, including the presence of hazardous gases or heavy dust, and will not become an ignition source. So, a permissible device isn’t about just being functional or having a broad voltage rating; it has to carry an approved status and be used within the defined conditions. Devices without that agency approval, or used outside the approved limitations (or outside the required environment), are not permissible.