Frequently Asked Questions About USB Plenum Cables

What is the difference between plenum and non plenum cables?

Plenum Cables are rated for air circulation spaces (like HVAC ducts or spaces above drop ceilings), have a fire-retardant jacket, typically made of low-smoke PVC or fluorinated ethylene polymer (FEP), Emit minimal smoke and toxic fumes when burned. , are required by building codes in plenum areas to reduce the risk of fire spreading through air circulation systems and typically more expensive due to their higher safety standards.

Non-Plenum Cables (Riser or General Purpose) are designed for vertical runs between floors (riser-rated) or general use outside plenum spaces. The jackets are less fire-resistant and emit more smoke and toxic gases when burned and not allowed in plenum spaces due to safety risks and are cheaper and more flexible than plenum cables.

When should I use plenum cable?

• You should use plenum USB cable when the cable will be installed in a plenum space, which is any part of a building that facilitates air circulation for heating, ventilation, and air conditioning (HVAC) systems - typically the area above drop ceilings or below raised floors.
• Local building or fire codes (like the National Electrical Code in the U.S.) require CMP-rated (Communications Plenum) cables.
• You are installing wiring in commercial buildings, schools, hospitals, or data centers where strict fire safety regulations apply.
• You want added safety in case of fire plenum cables emit less toxic smoke and resist flame spread.

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