IDEAL Industries 30-148 Pre-Insulated Crimp Connectors

The NC-8 pre-insulated crimp connector is rated 600V minimum and takes from four #16 conductors down to a single #12 combined with four #14. That range is what decides whether it fits your splice, so count the conductors in the box before you crimp: anything outside four #16 max or 1 #12 with 4 #14 needs a different connector size.

Yes, they carry a 1,000 V maximum in fixtures and signs, and the shell is UL 94V-2 flame retardant rated at 105 degrees C (221 degrees F). Maximum temperature rating is 150. For fixture and sign wiring that runs hot, those two numbers are the ones to check against your ballast or driver compartment temperature.

Crimp is the right call where vibration would work a twist-on loose. A crimp connector makes a permanent pressure-type connection, so it does not back off the way a threaded-on connector can in high vibration environments or on an OEM assembly line. The tradeoff is that the splice is not reusable: once the NC-8 is crimped it comes off by cutting. If you expect to re-open the splice for service or troubleshooting, use a twist-on instead.

The shell is translucent, so you can look through it and confirm the conductors bottomed out before crimping. Two features help you get there: a beveled opening that eases wire entry, and a flared skirt that keeps turned-back strands from escaping the barrel. That visual check is the practical acceptance test on an inspection, since you can see copper in the barrel rather than trusting feel.

Compact body, and that is the point of the design: it fits into tight locations where a twist-on's profile would fight the box fill. For lighting retrofits and canopy splices where you are folding conductors back into a shallow enclosure, the smaller crimped profile is the reason to pick it.

Yes, these are pressure-type crimp connectors, so they require a crimping tool sized for pre-insulated connectors. There is no threaded or hand-twist option on the NC-8, and the connector is not supplied with a tool. Budget the crimper separately if your crew is coming off twist-ons.

The 30-148 ships as a carton of 1,000 connectors. That is a production or fleet quantity, not a service pack, so it suits an OEM run, a multi-family lighting retrofit, or an MRO shelf being standardized on one splice, rather than a single-job repair.

Same part. IDEAL Industries catalog number 30-148 is the NC-8 pre-insulated crimp connector, and it is ordered under either designation. If a spec or a bill of material calls out NC-8, 30-148 is what you buy.