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What’s the differences of CM,CMR,CMP ?
author:admin | DATE: 2017-09-27 15:04 | Browse
We use terms like CM, PVC and LSZH to describe communications cable every day, but do you know what these terms really mean? And, more importantly, which one does your project actually need? The guide below will outline many industry cable types, alon
What’s the differences of CM,CMR,CMP ?
We use terms like CM, PVC and LSZH to describe communications cable every day, but do you know what these terms really mean? And, more importantly, which one does your project actually need? The guide below will outline many industry cable types, along with some acronyms that are often used synonymously
The most common terms used to describe communications cables are CM, CMR and CMP. When you see “C” and “M” used as part of a cable’s descriptor, it indicates that the cable can be used in accordance with the National Electrical Code (NEC or NFPA 70).
In the case of CM, the standard outlines general use, or use in cases where the fire code does not place any restrictions on cable type.
CMR cable, often called “riser-rated cable,” is constructed to prevent fires from spreading floor to floor in vertical installations. It can be used when cables need to be run between floors through risers or vertical shafts.
Even higher rated is CMP (plenum-rated cable). This cable is designed to restrict flame propagation to no more than five feet, and to limit the amount of smoke emitted during a fire. This makes it suitable for installation into air plenum spaces, including the space above a suspended ceiling where environmental air can pass through.
We use terms like CM, PVC and LSZH to describe communications cable every day, but do you know what these terms really mean? And, more importantly, which one does your project actually need? The guide below will outline many industry cable types, along with some acronyms that are often used synonymously
The most common terms used to describe communications cables are CM, CMR and CMP. When you see “C” and “M” used as part of a cable’s descriptor, it indicates that the cable can be used in accordance with the National Electrical Code (NEC or NFPA 70).
In the case of CM, the standard outlines general use, or use in cases where the fire code does not place any restrictions on cable type.
CMR cable, often called “riser-rated cable,” is constructed to prevent fires from spreading floor to floor in vertical installations. It can be used when cables need to be run between floors through risers or vertical shafts.
Even higher rated is CMP (plenum-rated cable). This cable is designed to restrict flame propagation to no more than five feet, and to limit the amount of smoke emitted during a fire. This makes it suitable for installation into air plenum spaces, including the space above a suspended ceiling where environmental air can pass through.