Abstract: An electrical meter assembly including a plug-in meter and a meter socket, each having terminals. An adaptor modifies a terminal of the meter socket, enabling the modified and unmodified terminals thereof to engage the terminals of the meter in only one orientation of the meter relative to the meter socket.

Abstract: A device for the coulometric measurement of the thickness of thin metal layers of different material on a base has switch-over devices permitting switching to the measurement problem at hand and an electrolytic switch-over device. Accessible from the outside of the device, a first plug section, coupling electrical lines, is provided. Second plug sections having a shape necessarily resulting in correct plugging can be selectively plugged into the first plug section. The second plug section mounts electrical circuit elements of values pertaining to a separate measurement problem, which elements are connected to the plug contacts.

Abstract: A coupler series connects in the power line to be monitored. Sensing circuitry within the coupler senses power flow in each direction of the power line, and produces D.C. signals representing the magnitude thereof. The D.C. signals appear at contacts on the body of the coupler.A housing is provided with a cavity for receiving the coupler. Contacts in the housing adjoin the cavity and are aligned to connect to the coupler contacts. A D.C. activated meter is mounted in the housing, and is electrically connected through a switch to the housing contacts.In operation, the coupler is series connected in the line and, when power is to be monitored, it is secured within the housing. By operating the switch, a user may monitor power flow in either direction down the line.

Abstract: A panel meter having a unique casing with an adapter on the casing. The meter movement is in a compartment of the casing and the adapter is secured to the casing and cooperates with the casing to define a compartment separate from the meter compartment. Components such as calibrating resistors and rectifiers can be installed, if required, in the separate compartment after the meter movement is installed in the casing. In the preferred embodiment, the casing has a configuration generally in the form of a segment of a cylinder, and the adapter has a segment configuration so that the casing and adapter present a generally cylindrical profile when joined. This arrangement permits using the same basic meter movement and casing to produce meters of different operating characteristics. The meter either with or without the adapter can be inserted through the usual circular opening of a mounting panel. The casing has toothed sides to retain a quick connect panel nut used to secure the meter to the panel.

Abstract: A locking arrangement for clamping a watthour meter to an assembly includes first and second locking members each having first end portions which engage an annular ridge of the watthour housing, offset portions which engage an annular ridge of the adapter housing and second ends which are secured to the adapter housing from a rearward surface of the adapter housing to make removal of the watthour meter from the adapter assembly more difficult.

Abstract: A test set, as used for indicating line conditions and line identification for telecommunication cables for example, has a casing formed from two identical mouldings. A rib and groove seal is provided for the mating surface by forming a rib on half the mating surface and a groove on the other half. Laterally extending webs form a channel in which the leads of the test set are wound when not in use. Ears on the webs extending towards each other form constrictions which maintains the leads in the channel. At the top of the casing, arcuate webs provide a protected region in which are situated a toggle switch and indicator lamps. Inside the casing, formations hold a printed circuit board and define a compartment for a battery.

Abstract: An electrical service entrance panelboard includes a plurality of stacked meter sections to which individual access is afforded by a vertical array of front covers. Each junction of the covers for adjacent meter sections defines an opening in which the watthour meter of one section is mounted. The portions of each junction flanking the meter opening are shingled to render the panelboard raintight.

Abstract: A metal case plastic-face meter box window cover having a metallic frame providing an exposed peripheral edge which is capable of being welded or soldered onto the meter box and having a transparent face of plastic material molded upon a peripheral flange of the metal case, with such peripheral flange forming a thin web of metal capable of conforming to the change of the plastic during its curing stage so as to prevent loss of adhesion therebetween.

Abstract: A flat meter assembly with a face displayed along one narrow end in edgewise fashion, the meter movement being mounted entirely in a molded frame and enclosed therein by a U-shaped top and bottom cover applied from the rear and a transparent face cover applied from the front, the two covers snapping together by integral fastenings. A series of lands and grooves along each side of the frame accept spring clips which are loaded by finger pressure and inserted between appropriate grooves and a mounting panel to secure the meter in place.

Abstract: A tamper-resistant electrical meter housing includes an unbreakable cover assembly that cooperates with a matable base to enclose a meter device supportable on the base. The cover assembly includes an annular ring secured to the cover. A locking leaf spring is coupled to the cover assembly. The leaf spring is aligned to slide along the top of a rim portion of the base and snap into a recess to lock the cover assembly against rotation and removal. Once the cover assembly is locked to the base, the leaf spring is substantially concealed from view, so that an unauthorized person cannot effect removal of the cover to obtain access to the meter. The base also includes a specific area in alignment with the recess, which area is identifiable only by an authorized person. A hole may be drilled in this area by an authorized person and a tool may then be inserted through this hole to effect disengagement of the leaf spring and removal of the cover assembly from the base.