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Grounding Electronic Enclosures

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Power distribution electrical enclosures are designed to supply power to electrical equipment, to start or stop the flow of power to electrical equipment and to monitor and detect the operation of electrical equipment. Power distribution cabinets protect the internal components from the surrounding environment and protects operators from electric shock. They come in many different shapes, sizes and materials. The power distribution enclosure will have holes made for pulling cables inside for incoming electric current and cables leaving for power distribution. Having the proper connectors are essential for maintaining the NEMA rating of the enclosure.

Enclosure grounding is an essential safety measure that must be installed in order to clear any electrical faults and to protect equipment from damage and operators from electric shock. Ungrounded or poorly grounded enclosures will not clear the electrical fault and can remain operating and energized. The ground path resistance from the enclosure back to the source ground must be very low, resulting in the fault current traveling quickly to ground. Grounding kits, bonding straps, grounding bars and insulated brackets are available to help facilitate proper enclosure grounding.

Products

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Hoffman ECFP08 Central Earthing Point, ECFP
Hoffman ECFP08 Central Earthing Point, ECFP
$341.60
Hoffman ECFP08 Central Earthing Point, ECFP. Provides earthing contact surface for horizontal or vertical frame profiles. For a secure earthing point with multiple connections for simple installation. Galvanized Steel 70mm x 42mm x 3mm.
Hoffman DGRJ Grounding Rack Jumper Kit
Hoffman DGRJ Grounding Rack Jumper Kit
$65.13
Grounds rack or cabinet to common bonding network under floor or overhead. Made of #6 AWG x 7 strand wire with green THW insulation and two-hole compression lug mounted on one end. Includes fasteners.
Hoffman DGT2 Lay-In Lug
Hoffman DGT2 Lay-In Lug
$105.43
Hoffman DGT2 Drip Shields Other Accessories
Hoffman DGT1 Lay-In Lug
Hoffman DGT1 Lay-In Lug
$132.60
Hoffman DGT1 Drip Shields Other Accessories
Hoffman DGLG Lay-In Lug
Hoffman DGLG Lay-In Lug
$172.90
Hoffman DGLG Drip Shields Other Accessories
Hoffman LRGGDKSS Grounding Kit
Hoffman LRGGDKSS Grounding Kit
$76.70
Hoffman LRGGDKSS Drip Shields Grounding Accessories
Hoffman LRGGDK Grounding Kit
Hoffman LRGGDK Grounding Kit
$69.16
Hoffman LRGGDK Drip Shields Grounding Accessories
Hoffman SMGDK Grounding Kit
Hoffman SMGDK Grounding Kit
$67.34
Hoffman SMGDK Drip Shields Grounding Accessories
Hoffman P2AGPK Grounding Plate Kit
Hoffman P2AGPK Grounding Plate Kit
$81.90
Hoffman P2AGPK Grounding Plate Kit
Hoffman ASG8 Ground Splitter (Ground Bar)
Hoffman ASG8 Ground Splitter (Ground Bar)
$67.06
Ground Splitter (Ground Bar) for Splitter Box or Splitter Trough.
Hoffman ASG4 Ground Splitter (Ground Bar)
Hoffman ASG4 Ground Splitter (Ground Bar)
$37.24
Ground Splitter (Ground Bar) for Splitter Box or Splitter Trough.
Ilsco TA-6S One Conductor Ground Lug
Ilsco TA-6S One Conductor Ground Lug
$3.90
Ilsco TA Series Aluminum Soderless Ground Lugs are Dual Rated-One Conductor. Electro-tin plated and made with high sterngth 6061-T6 aluminum alloy for low contact resistance and maximum durability. Chamfered opening to make wire installation easy. UL listed ideal for up to 2000 volts.

 

All devices and signals within a panel should be tied back to one single location. It is common to see several different devices within a control panel that need to be grounded. No matter the number of devices, it is essential to ensure that everything comes together in one location. This location is where the main utility power and grounding conductor  enters the panel. It can also be where the enclosure is grounded to an exterior ground rod. Tying everything to the utility ground or ground rod, allows any short circuits and surges to be dissipated out of the control panel, protecting sensitive equipment. It can also help to reduce any chances of creating ground loops within the enclosure.

Analog signal grounding. Typically, analog signals have shielded wire to protect the signal from “noise” or distortion that could potentially corrupt the signal.  This shielding needs to be grounded in order to dissipate that “noise”. It is important to know that this shielding should only be grounded at one location along the circuit, typically within the control panel where the conductors are being terminated, and not on the field side of the device. If both ends of the shielding are terminated, it can cause issues with the signals as well as create potential ground loops.  

AC and DC circuit grounding. In some cases, it is necessary to isolate the AC ground from the DC ground, but in the case of most industrial control panels it is common to see these two types of power share a “common ground”. This is done by tying the DC negative portion of the DC bus to the AC ground bus within the control panel. This allows everything, including all AC and DC circuits, to be tied back to one single location within the panel. 

Outdoor enclosure grounding. When an industrial control panel is being installed in an outdoor location, or anywhere that it might be exposed to the elements, it is critical to install a ground rod and ensure that the enclosure is tied to that ground rod. In the event of a lighting strike, the ground rod will allow the bulk of that energy to be dissipated directly into the ground, while protecting the hardware within the panel.  

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