Training Services - Control Panel Wiring

Training Services  »  Control Panel Wiring

LEARN CONTROL PANEL WIRING IN WIZTECH

It is one of the sub courses in WIZTECH which is combined with your PLC and DCS courses. Wiztech gives flow of knowledge about the Control panel wiring and its parts, importance of parts or items in control panel wiring is limit switches, push buttons, toggle switch, output relays, i/o unit of PLC / DCS, contactors, VFD power circuit and control diagram. In this course gives simple and best wiring methods for students.

Wiring within the Panel – Power Circuits

There are two primary things to consider regarding wiring within the panel: what type of wiring to use, and how to apply it. The current and new standards address the types of wire permitted. To generalize, they are listed thermoplastic or thermoset insulated building wire types, recognized wires, machine tool wiresand welding cable.

Generally speaking, users prefer the more flexible wires or welding cable for power circuits as they are easier to route and facilitate improved cable management inside the cabinet. Routing, fastening,splicing, and sizing requirements are all detailed in the standards. Of specific interest is the requirement that power conductors shall not be smaller than 14 AWG.

Wiring within the Panel – Control Circuits

Control wiring can be any of the wiring methods allowed for power circuits within the panel with the addition of power-limited circuit cable and communication cable Control circuits are unique in that many controls now use industrial networking cabling technology. Because of this, it is important that the cabling within the panel maintains the signal integrity. In such cases, it is generally necessary to use specialty cabling between the cabinet entrance point and the end device.

Also unique to the control circuits are the types of modular connectors used on the cabinets. There are thousands of varieties that range from low-cost simple to install and use to very expensive, highly engineered solutions for the most severe conditions and demanding communication requirements.

Field Wiring – Power Circuits

Wiring between the branch circuit supply and the control panel should be done in accordance with the local electrical code, which is usually some variation of the NEC (National Electrical Code). However, UL 508 clearly allows the use of portable cord for cabinets that are portable or mobile with the use of a hand truck or forklift, where there are no other provisions for conduit or permanent connection to the building. The type of cord permitted is a hard service or junior hard service cord such as an SO or SJO (or other similar variation) that terminates in a listed attachment plug.

Field Wiring – Control Circuits

Field wiring types are once again determined by the local authority having jurisdiction, usually referencing the NEC, and again there is a provision for connection of field control wiring using cords. Unique to control circuits are the number of different types, ratings, styles andconfigurations of connectors that may be used to facilitate connection to the enclosure for quick disconnection or environmental sealing.