An artificial lighted tree is presented with power routed through the trunk of the tree and three-wire safety grounding. The artificial lighted tree comprising a fused electrical plug having improved safety features comprising: a body portion surrounding respective first ends of a first, a second and a third electrical wire, the body portion further comprising a fuse holder embedded within an upper region of the body portion, and a fuse adapted to be releasably secured within the fuse holder via releasable securing means, a live blade in electrical communication with the first end of the first electrical wire, a neutral blade in electrical communication with the first end of the second electrical wire, a ground pin receptacle in electrical communication with the first end of the third electrical wire, wherein the body portion surrounds and maintains the live blade, neutral blade, and ground pin receptacle in spaced apart orientation corresponding to polarized sockets on an electrical wall outlet.

A swivel joint includes a tail section and a body portion that define a passageway therethrough and which can rotate relative to one another. One or more seals and bearings can be disposed between the tail section and the body portion. An electrical conductivity grease fitting can be mounted within a bore hole in the body portion. The electrical conductivity grease fitting can have a lubricant passed therethrough to lubricate the bearings. The electrical conductivity grease fitting has a first portion in electrical communication with the body portion and a second portion that is biased into electrical communication with the tail section to maintain electrical conductivity between the tail section and the body portion.

A coaxial connector includes a connector front end connectable with a circuit board and a connector rear end connectable with a coaxial cable. An outer conductor arrangement connectable with an outer conductor of a coaxial cable at the connector rear end, which has a compensator means arranged at the connector front end and has at least one cup spring having a contacting zone configured to contact a contact face of a circuit board to establish an electrical interconnection between the outer conductor arrangement and the contact face. The cup spring has a center aperture that is at least partially encircled by the contacting zone. An inner conductor arrangement includes a contacting tip configured to contact a contacting point of a circuit board via the center aperture of the compensator means to establish an electrical contact between the inner conductor and the contacting point.

An improved electrical power cord adapted to enhance the safety of an artificial lighted tree is presented. Various embodiment electrical power cord design implementations may include a three-prong safety grounded plug located at a first distal end of the electrical power cord, the plug electrically coupled to a multi-conductor cable comprising a neutral member, a hot member and a ground member; a circuit protector connected in-line with the multi-conductor cable, the circuit protector comprising a fuse, or, a circuit breaker, having stationary and movable contacts operable between open and closed positions, and a manually operable reset button operably configured with the circuit breaker and electrically connected between said circuit breaker and the ground member for selectively actuating said circuit breaker for opening said movable contacts; a polarized female socket located at a second distal end of the electrical power cord, wherein the hot member of the multi-conductor cable is electrically coupled to the circuit breaker at a first connection point; and wherein the neutral and hot members of the multi-conductor cable are electrically coupled to the polarized female socket at a second connection point.

The device for holding at least one electrically conductive pipe on an electrical conductive structure with an electrical connection between such a structure and at least one such pipe includes a holding half-flange, a fastening half-flange to be fastened to the structure, to be assembled with the holding half-flange, and an electrical connection device for electrically connecting the structure and the pipe or pipes. The electrical connection device includes at least one pad, made of an electrically conductive flexible material, lining the fastening half-flange, and configured to electrically cooperate with one of the pipes. The device also includes at least one pusher, made of an electrically conductive material, configured to electrically cooperate with the structure as well as with the pad or with one of the pads of the fastening half-flange, movable in displacement between an extended position outside the fastening half-flange and a retracted position inside this fastening half-flange.

A clamping assembly for attaching a grounding conductor to a pipe having a protective coating includes an elongate conductive strap and a clamp. The conductive strap is sufficiently long to circumferentially surround the pipe and has longitudinally spaced sharp projections that are sufficient to penetrate the protective coating around the pipe to make an electrical coupling between the strap and a conductive part of the pipe beneath the protective coating. The clamp is coupled to the grounding conductor and clamps the conductive strap to the pipe at a tension sufficient to maintain an electrical connection between the conductive part of the pipe and the grounding conductor without the need for any welding of the grounding conductor to the pipe and without the need for any stripping of the protective coating from the pipe.

A mechanical grounding clamp includes a body, having an upper plate defining a threaded hole therethrough and having an outer surface, a lower plate spaced apart from the upper plate and having an inner surface, and a connecting plate connecting the upper plate to the lower plate; a set screw mateable with the threaded hole in the upper plate and having a proximate end and a distal end, the distal end extendable through the threaded hole of the upper plate and toward the inner surface of the lower plate. There may be a nut on the set screw for driving toward the upper plate to secure a grounding conductor to the body. Optionally there is a cap defining a set screw hole therethrough and having an inner surface, the cap affixable to the outer surface of the upper plate with the set screw passing through the set screw hole; the nut may secure the cap to the upper plate.

A transition fitting for achieving a rain-tight transition at the entry of photovoltaic cables with EMT. The transition fitting includes a fitting body with an internal bore, a grommet seated within the bore, a nut for tightening the grommet against the fitting body, a compression fitting and a ground lug extending from the nut. A plurality of bores extend partially through the grommet. Photovoltaic (PV) cables may be inserted within one or more of the bores in the grommet and the nut tightened upon the fitting body to form a rain-tight fit around the PV cables. The skins of the grommet remain intact in any unused bores to maintain a rain-tight seal on any unused bores. The transition fitting will maintain a rain-tight seal at the entry of PV cables to EMT. The ground lug provides a means of grounding the EMT to the transition fitting.

Various implementations of grounding clamps and torque-controlled fasteners are disclosed. The grounding clamps may be used to attach grounding conductors to various structures, such as pipes, conduit, grounding rods etc. The torque-controlled fasteners may use various techniques to control the amount of torque applied to the fasteners used with the grounding clamps described herein.

A coupling for connecting pipe ends, comprising a hollow body with an entrance for each pipe end provided with a radial seat for a pipe end and a coupling nut for clamping the pipe end, whereby an electrically conductive bridge is provided, which at the location of the seats is provided with a clamping element that is elastically deformable in the radial direction with respect to the respective seat, and is provided with a contact section, which in a rest situation is at a distance from the axis of the seat that is smaller than an outside radius of the pipe end for which the seat concerned is intended.