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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 ASTB85 Splitter Trough Block Assembly, 600V 85A 14-1 kcmil, Brushed, Aluminum
Hoffman ASTB85 Splitter Trough Block Assembly, 600V 85A 14-1 kcmil, Brushed, Aluminum
$40.30
Hoffman ASTB85 Each 600-volt block includes a main lug and branch lugs, together with copper/aluminum (CU/AL) connectors secured to insulators.
Hoffman ASTB600 Splitter Trough Block Assembly, 600V 600A 4-600MCM:1/0-250 kcmil, Brushed, Aluminum
Hoffman ASTB600 Splitter Trough Block Assembly, 600V 600A 4-600MCM:1/0-250 kcmil, Brushed, Aluminum
$139.10
Hoffman ASTB600 Each 600-volt block includes a main lug and branch lugs, together with copper/aluminum (CU/AL) connectors secured to insulators.
Hoffman ASTB400 Splitter Trough Block Assembly, 600V 400A 4-600MCM:1/0-250 kcmil, Brushed, Aluminum
Hoffman ASTB400 Splitter Trough Block Assembly, 600V 400A 4-600MCM:1/0-250 kcmil, Brushed, Aluminum
$95.16
Hoffman ASTB400 Each 600-volt block includes a main lug and branch lugs, together with copper/aluminum (CU/AL) connectors secured to insulators.
Hoffman ASTB225 Splitter Trough Block Assembly, 600V 225A 6-300MCM kcmil, Brushed, Aluminum
Hoffman ASTB225 Splitter Trough Block Assembly, 600V 225A 6-300MCM kcmil, Brushed, Aluminum
$54.99
Hoffman ASTB225 Each 600-volt block includes a main lug and branch lugs, together with copper/aluminum (CU/AL) connectors secured to insulators.
Hoffman ASTB125 Splitter Trough Block Assembly, 600V 125A 14-1/0 kcmil, Brushed, Aluminum
Hoffman ASTB125 Splitter Trough Block Assembly, 600V 125A 14-1/0 kcmil, Brushed, Aluminum
$42.38
Hoffman ASTB125 Each 600-volt block includes a main lug and branch lugs, together with copper/aluminum (CU/AL) connectors secured to insulators.
Stahlin RESTPRSTG3 Hub
Stahlin RESTPRSTG3 Hub
$280.11
Stahlin RESTPRSTG3 1 Inch PVC Coated STG Rigid Conduit Knockout Hub w/ Ground Need holes, custom windows, or digital printing? BUILD A MODIFIED ENCLOSURE
Stahlin RESTPRSTG2 Hub
Stahlin RESTPRSTG2 Hub
$261.16
Stahlin RESTPRSTG2 3/4 Inch PVC Coated STG Rigid Conduit Knockout Hub w/ Ground Need holes, custom windows, or digital printing? BUILD A MODIFIED ENCLOSURE
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.
Rittal 2412210 Grounding Braid
Rittal 2412210 Grounding Braid
$297.63
Rittal 2412210 Network and Server Rack IT Infrastructure, Tin-plated copper, in various lengths and cross-sections with press-fit contact rings, to counteract the proximity effect at high frequencies, while offering flexible connection options., Height: "
Rittal 7829150 Extension set grounding/potential equalization
Rittal 7829150 Extension set grounding/potential equalization
$112.49
Rittal 7829150 Interior Fittings Accessories, To supplement the existing grounding or potential equalization sets for integrating additional installation components into the potential equalization system. For targeted contacting of the installation components with the enclosure frame. Ground conductors are pre-assembled with connectors ready for connection and cut to the correct length.
Rittal 7829110 Grounding Kit, Pre-Assembled for TS IT
Rittal 7829110 Grounding Kit, Pre-Assembled for TS IT
$301.24
Rittal 7829110 Interior Fittings Accessories, To integrate star grounding with pre-assembled ground conductors on an equipotential bonding strip in network enclosures.
Rittal 7829100 Grounding Kit, Pre-Assembled for TS IT
Rittal 7829100 Grounding Kit, Pre-Assembled for TS IT
$288.61
Rittal 7829100 Interior Fittings Accessories, To integrate star grounding with pre-assembled ground conductors on an equipotential bonding strip in network enclosures.

 

Grounding in a Control Panel

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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