All communication cable types except which may be used in cable trays?

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Multiple Choice

All communication cable types except which may be used in cable trays?

The key idea is that only cables with a listing for tray use may be run in cable trays. The CM designation is general-purpose communications cable; CMR is approved for vertical or riser runs; CMP is rated for plenum (air‑handling) spaces. Each of these has a listing that includes installation in cable trays, so they can be used in trays. CMX, however, is not listed for tray installation; it’s intended for other applications and environments, not cable trays. That’s why it’s the exception and cannot be used in cable trays.

The key idea is that only cables with a listing for tray use may be run in cable trays. The CM designation is general-purpose communications cable; CMR is approved for vertical or riser runs; CMP is rated for plenum (air‑handling) spaces. Each of these has a listing that includes installation in cable trays, so they can be used in trays. CMX, however, is not listed for tray installation; it’s intended for other applications and environments, not cable trays. That’s why it’s the exception and cannot be used in cable trays.

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