Electrical and Installation Guides Page 2: 257 technical guides for choosing Electrical and Installation products: selection criteria, standards, common mistakes and frequently asked questions.
What Is an Earth Terminal Block? Types and Selection Criteria — An earth (ground) terminal block is a yellow-green DIN rail terminal block that connects the protective conductor (PE) to the mounting rail through its metal foot. What Is a 1-In 2-Out Terminal Block? Uses and Selection Criteria — A 1-in 2-out terminal block is a DIN rail terminal block with one connection point on one side and two on the other, joining three conductors at the same potential. What Is a Three-Phase Rubber Plug? Types and Selection Criteria — A three-phase rubber plug is a rubber-bodied plug fitted to a portable three-phase machine or extension cord, mating with a three-phase rubber socket of the same system. What Is a Mini Terminal Block End Stop? Use and Selection Criteria — A mini terminal block end stop is a small fixing part fitted to the ends of a row of mini terminal blocks to stop the terminals sliding along the mounting rail. What Is a Deep Knock-Out Junction Box? Sizes and Selection Criteria — A deep knock-out junction box is a surface-mounted opaque ABS box deeper than a standard box of the same base, with cable entries opened by breaking out knock-outs. What Is a Closed-End Connector? Types and Selection Criteria — A closed-end connector is a connection cap with an insulating body closed at one end, into which stripped conductor ends are inserted together and crimped. What Is a Panel Label? Types and Selection Criteria — A panel label is a label stuck on an electrical panel's door, devices and circuit outputs to show the circuit name or an electrical hazard warning. What Is a Measuring and Disconnect Terminal Block? Types and Selection Criteria — A measuring and disconnect terminal block is a screw-connection DIN rail terminal that isolates a circuit and connects an instrument without removing conductors. What Is a Twist-On Junction Box Connector? Sizes and Selection Criteria — A twist-on junction box connector is an insulated splice connector that is turned onto stripped conductor ends and clamps them together with a threaded metal insert. What Is an Enclosure Cooling Thermostat? Types and Selection Criteria — An enclosure cooling thermostat closes its NO contact to run the filter fan when the panel temperature exceeds the set point and stops the fan when it falls. What Is a Surface-Mounted Junction Box with Plugs? Sizes and Selection — A surface-mounted junction box with plugs is an ABS splice and distribution box mounted on a wall or ceiling, with its cable entries closed by conical plugs. What Is a Screw Cable Clip? Types and Selection Criteria — A screw cable clip is a plastic fastening element fixed to a surface with a screw through its body, holding a cable or cable bundle in place. What Is a Bathroom Exhaust Fan? Types and Selection Criteria — A bathroom exhaust fan is a small-diameter electric fan fitted into a ventilation duct to expel humid, stale air from bathrooms, toilets and laundry rooms. What Is a Straight-Type Cable Gland? PG Sizes and Selection Criteria — A straight-type cable gland is a simple polyamide gland that holds the cable by compressing a seal and washer with a pressure cap, used at panel and junction box entries. What Is a Connector Protective Cover? Types and Selection Criteria — A connector protective cover is a blind cover that closes the exposed contact face of an unmated multi-contact plug or socket against dust, water and impact. What Is an Electric Fan? Types and Selection Criteria — An electric fan is an air circulation device that moves the air in a room with a blade turned by an electric motor, creating a cooling sensation. What Is a Panel Heater? Types and Selection Criteria — A panel heater is an electric heater that warms the air inside an electrical panel to prevent condensation, icing and moisture-related faults. What Is a Non-Insulated Cable Terminal? Types and Selection Criteria — A non-insulated cable terminal is a metal cable end without a plastic sleeve, crimped onto the conductor and fitted under a screw with its ring or fork end. What Is a Single-Phase Industrial Plug? Types and Selection Criteria — A single-phase industrial plug connects a single-phase device or extension cable to a 16 A 2P+E socket and has an impact-, dust- and water-resistant body. What Is an EMC Cable Gland? Types and Selection Criteria — An EMC cable gland is a nickel-plated brass gland that grips the braided shield of a cable 360° and bonds it to the metal enclosure to reduce electromagnetic interference. What Is a Lever Junction Box Terminal Block? Types and Selection Criteria — A lever (tabbed) junction box terminal block is a screwless splice block with an open-close lever on each conductor entry; it joins conductors without tools and opens when the lever is lifted. What Is a Spiral-End Sealed Cable Gland? Sizes and Selection Criteria — A spiral-end sealed cable gland is a plastic gland whose flexible spiral sleeve stops the cable bending sharply and breaking at the outlet while sealing it into the housing. What Is a Brass Fixed-Type Spiral Fitting? Types and Selection Criteria — A brass fixed-type spiral fitting is a brass fitting, with body and thread in one piece, that connects the end of a metal spiral conduit to an enclosure, box or machine housing entry. What Is a Slit Polyamide Spiral Conduit? Types and Selection Criteria — A slit polyamide spiral conduit is a flexible polyamide cable protection conduit that is slit along its length, so it can be fitted from the side without removing cable ends.