These ETL listed Pass-Thru Wiring Box are intended to provided a robust, secure, and code compliant method of transferring the Multi-Contact USE-2 type conductor coming from the PV array to THHN/THWN-2 type conductor. The PTWB also provides a convenient location to begin the necessary conduit run from the PV array to the power conditioning equipment. The NEMA 4 enclosure dimensions are 8" x 6" x 4". It has two cord grips for array wire entry and a hole on the opposite side for a 1/2" conduit fitting. There are two terminal blocks for positive and negative conductors and one for ground. It is designed to be mounted directly on the side of the module mounting rail.