3M Standard Cable Ties CT8_50-C

Yes. The 3M CT8 standard cable tie is UL Listed 62275 Type 21 or 21S and Plenum Rated AH-2 for use in air handling spaces, so it can go above a ceiling return or in a duct chase where a non-rated nylon tie would not be accepted.

They solve two different stocking problems. The 3M CT8_50-C is a single consistent tie - 7.6 in overall length, 50 lbs tensile strength - ordered by color, with black, red, and natural offered, and supplied 1000 per case, so it suits a crew that standardizes on one size and buys depth. The Burndy CTASST is a Unirap cable tie canister variety pack in natural and black, which gives a mix in one canister rather than a single length and strength. If you are bundling the same harness work repeatedly and need the UL 62275 Type 21 or 21S listing and AH-2 plenum rating called out on the 3M tie, the single-spec tie is the one to carry; if you want an assortment on hand for odd jobs, the variety pack covers that.

Do not assume it carries over. The 3M CT8_50-C is specifically called out as UL Listed 62275 Type 21 or 21S and Plenum Rated AH-2 for use in air handling spaces, which is the rating an inspector looks for above a ceiling return. The Burndy CTASST is a Unirap cable tie canister variety pack in natural and black; confirm the plenum rating on the specific Unirap tie you pull from the canister before using it in a return air plenum. For plenum bundling where the rating has to be documented, the 3M tie states it outright.

At 50 lbs tensile (22.68 kg), the CT8 is a standard-duty tie, which covers most indoor bundling of THHN branch circuits, control wire, and low voltage harnesses. For overhead messenger support, outdoor strain, or heavy feeder bundles, step up to a heavy-duty tie with a higher tensile rating.

The 3M CT8 is sold in bulk cartons of one size and color, which suits repeat production work. If you want a mix on the truck instead, the Burndy CTASST Unirap cable tie canister variety pack comes in natural and black with assorted ties in one container.

No. The Burndy CTASST Unirap canister pack is natural and black only. The 3M CT8_50-C is offered in red as well as black and natural, so if you are color-coding bundles by circuit, system, or trade, the red option is the one that supports it while keeping the same 7.6 in length and 50 lbs tensile strength across every color.

A single-length tie is the wrong tool for that. The 3M CT8_50-C is one size at 7.6 in overall length, which caps the bundle diameter it will wrap. For mixed-diameter work, the Burndy CTASST Unirap cable tie canister variety pack puts an assortment in one canister in natural and black. Keep the 3M tie for repeat bundles at a known diameter where you want the 50 lbs tensile strength and the AH-2 plenum rating consistent across the job.

Three: black (BK), red (RD), and natural (NT). Black is the usual pick for exposed work since it hides better, red is used for color-coding circuits or emergency systems, and natural is the general purpose choice for concealed bundles.

The CT8 has a curved tip, which starts into the head without hunting for the slot, so single-handed threading overhead is quicker. It also holds the bundle without slipping once tensioned. These are made in the USA.