IDEAL Industries 30-251 High-Temp Wire-Nut® Wire Connector, Model 71B® Black, Keg of 25,000

Yes. The Model 71B, along with the 72B and 73B, is rated for use in air handling spaces, so it can go in a plenum ceiling return or similar space where ordinary connectors are not permitted.

That is what it was built for. The 71B High-Temp Wire-Nut is designed to withstand the extreme heat build-up found in high-wattage light fixtures and signs, which is the main reason to reach for it over a standard-temperature twist-on connector.

They are. The 71B is approved for bonding and grounding applications, so it can be used on equipment ground splices as well as line and neutral connections.

No. The IDEAL 30-251 is a twist-on Model 71B high-temp Wire-Nut wire connector, a small insulated spring-shell cap that joins two or more conductors inside a box or fixture and is twisted on with the fingers. The Leviton 8319-C is a hospital grade NEMA 5-20R connector and the Bryant 8269T is a hospital grade NEMA 5-15R connector; both are cord-end devices that accept a mating plug, so neither makes a splice. If the job is a conductor-to-conductor splice in a high-wattage fixture or sign, the 30-251 is the correct family; if it is a cord-and-plug connection, the 8319-C or 8269T is.

The IDEAL 30-251 Model 71B is built for heat rather than water - it is designed to withstand the extreme heat build-up found in high-wattage light fixtures and signs, and the 71B, 72B and 73B models are rated for use in air handling spaces. For a connection exposed to weather or washdown, the Bryant WPC series weatherproof wiring connector fitting or the Pass and Seymour Turnlok 27W series 20A watertight connector, rated NEMA 4X/6P, address the environment the 71B does not. Those are mating cord connectors, so the wiring method has to suit them.

Yes. The 71B is called out as excellent for fine stranded wire applications, and it uses a fixed square-wire spring rather than a tapered coil, which is what keeps the grip on stranded conductors.

The 30-251 is a keg of 25,000 black Model 71B connectors. That is a bulk pack aimed at fixture manufacturers, sign shops and large MRO or new-construction stock rooms rather than a service van.

No, and this trips people up because the word connector covers both. The 30-251 is a twist-on wire splice connector (Wire-Nut). If you need a plug-style connector body, that is a different product entirely, such as the Bryant 8269T hospital grade NEMA 5-15R connector or the Pass and Seymour Turnlok 27W Series 20A watertight connector rated NEMA 4X/6P.

They are different device types despite both being called connectors. The IDEAL 30-251 is a twist-on Model 71B insulated wire connector with a fixed square-wire spring, used to splice conductors and approved for bonding and grounding applications. The Leviton ML2-C is an ML2 series midget connector for electrical wiring, supplied in packs of 100, and is a mating wiring device rather than a twist-on splice cap. Choose by the connection being made, not by size.

They sit at different points in the circuit. The IDEAL 30-251 supplies Model 71B high-temp Wire-Nut connectors in a keg of 25,000 for in-box splicing, with a range refined to handle common applications and good performance on fine stranded wire. The Leviton 15W33 is an industrial grade straight blade connector, 3-wire 2-pole, rated 125V 20A, for terminating a cord to accept a plug. A plant standardizing on both would stock the 30-251 for splices and the 15W33 for equipment drops.

No. The 71B has a positive grip shell meant to be twisted on with fingers, which matters when you are making hundreds of splices in a fixture assembly line or a sign cabinet.