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Multi-Level Terminal Block Wiring Standards

Terminal Blockare pieces of electrical equipment used to connect wiring among otherwise isolated components. Some terminal blocks have multiple levels and thus require specific wiring standards.


  1. Because terminal blocks are used to connect a large number of wires, it is easy for them to become disorganized. Since these blocks must be routinely serviced, it is recommended the wires be carefully arranged and organized. This promotes safety and allows service providers to carry out their jobs efficiently.

    Multiple Levels

  2. Terminal blocks may be one level, two levels or three levels. Because they allow users to increase the installation density of wiring system, multilevel terminal blocks are most commonly used in high-density wiring applications.

    Internal Jumpers

  3. Some multilevel terminal blocks come with internal jumpers used to connect multiple levels together. This allows the levels to be electrically common instead of electrically isolated, thereby creating a more unified electrical system.
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