Basics of Panelboards

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Commercial and industrial power distribution

Electricity distribution is the final stage in the delivery of electricity to end users. A distribution system’s network carries electricity from the transmission system and delivers it to consumers. Typically, the network would include medium-voltage (1kV to 72.5kV) power lines, substations and pole-mounted transformers, low-voltage (less than 1 kV) distribution wiring and sometimes meters.

A power distribution system consists of metering devices to measure power consumption, main and branch disconnects, protective devices, switching devices to start and stop power flow, conductors, and transformers. Power may be distributed through various switchboards, transformers, and panel-boards.


In an electric power system, switchgear is the combination of electrical disconnect switches, fuses or circuit breakers used to control, protect and isolate electrical equipment. Switchgear is used both to de-energize equipment to allow work to be done and to clear faults downstream. This type of equipment is important because it is directly linked to the reliability of the electricity supply.  Next figure displays a general switchgear.

2Disconnect Switch

In electrical engineering, a disconnector, disconnect switch or isolator switch is used to ensure that an electrical circuit is completely de-energised for service or maintenance. Such switches are often found in electrical distribution and industrial applications, where machinery must have its source of driving power removed for adjustment or repair. High-voltage isolation switches are used in electrical substations to allow isolation of apparatus such as circuit breakers, transformers, and transmission lines, for maintenance. The disconnector is usually not intended for normal control of the circuit, but only for safety isolation. Disconnector can be operated either manually or automatically (motorized disconnector). Following figure displays a typical disconnect switch.


A transformer is a static electrical device that transfers energy by inductive coupling between its winding circuits. A varying current in the primary winding creates a varying magnetic flux in the transformer’s core and thus a varying magnetic flux through the secondary winding. This varying magnetic flux induces a varying electromotive force (emf) or voltage in the secondary winding. Transformers can be used to vary the relative voltage of circuits or isolate them, or both.

Transformers range in size from thumbnail-sized used in microphones to units weighing hundreds of tons interconnecting the power grid. A wide range of transformer designs are used in electronic and electric power applications. Transformers are essential for the transmission, distribution, and utilization of electrical energy. Following figure shows a Pole-mounted distribution transformer with center-tapped secondary winding used to provide ‘split-phase’ power for residential and light commercial service, which in North America is typically rated 120/240 volt.


An electric switchboard is a device that directs electricity from one source to another. It is an assembly of panels, each of which contains switches that allow electricity to be redirected. The U.S. National Electrical Code (NEC) defines a switchboard as a large single panel, frame, or assembly of panels on which are mounted, on the face, back, or both, switches, overcurrent and other protective devices, buses, and usually instruments. The role of a switchboard is to divide the main current provided to the switchboard into smaller currents for further distribution and to provide switching, current protection and metering for these various currents. In general, switchboards distribute power to transformers, panelboards, control equipment, and ultimately to system loads. Next figure displays a typical switchboard.

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protective fuse ,main switch, recent boards, Residual-current devices (RCD) ,Current Breakers with (RCBO), Fuses, overcurrent protection,  Short circuit, overloading, mismatched loads , device failure , fuse interrupts excessive current,  (blows) , overheating or fire is ,maximum fuse current rating, Slow blow fuses ,overload, Fuses , Self-resetting fuses , overload has cleared, aerospace , nuclear applications where fuse replacement is impossible, miniature time-delay fuse used to protect electronic equipment, Non-time-delay Fuses ,  Non-time-delay fuses ,Time-delay Fuses, time delay fuse allows a momentary overload ,startup current, blow in just milliseconds , excess current flow or a short is detected, Fusible disconnect switch, interrupt, Circuit Breaker, circuit breaker ,absolutely essential device in the modern world, circuit breakers ,fuses, Circuit breaker voltage, Continuous current rating, Circuit breakers , voltage rating ,circuit breaker , circuit breaker , continuous current rating , Power Supply Systems, Power  stepped down, transformer for distribution , residential, commercial, industrial facility, transformer secondary windings, Edison 3-wire system , Circuit breakers ,fuses, grounding conductor (green insulation, or bare wire) , Three Phase Four Wire Wye ,Three Phase Three Wire Delta, Service Entrance Panelboards,  equipment grounding conductors , neutral current ,ground Fault, ground fault , electric shock, dangerous voltage on metal parts of the electrical system and the building from a line-to-ground fault , protection device ,(trip the breaker or blow the fuse),  ground Fault Protection, ground fault , “GFCI” is a ground fault circuit interrupter, ground fault circuit interrupter , branch circuits, GFCI detects ground faults

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