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Episode 05 · July 2026 · Technical Foundations

Going2Ground

Before replacing the box, investigate what the box is standing on. Grounding and bonding are not background utilities. They are part of the AV and network system.

Loren Roetman · Platform Technology Specialist · Scowcroft Associates

GroundingBondingAV InfrastructureNetwork Systems
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Going2Ground — The Video Companion

3:17 · Technical Foundations

Watch the technical overview, then continue below for the complete Going2Ground field perspective and investigation sequence.

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Every sophisticated AV system eventually encounters a problem that refuses to behave like a product problem.

The amplifier hums. A display loses synchronization. A network device becomes intermittent. A system behaves perfectly until a dimmer, HVAC unit, motor, or inverter changes state. Then the familiar ritual begins: cables are replaced, electronics are swapped, filters are added, and another expensive box is asked to cure a symptom whose source may sit beneath the entire system.

Before treating what appears at the surface, go to ground.
The Big Idea

Ground is not a place where unwanted electricity disappears.

In an electrical system, “ground” can describe several related things: a connection to earth, a conductive path intended to carry fault current, a bond between conductive parts, or the reference against which signals and voltages are understood. Those jobs overlap, but they are not interchangeable.

For the integrator, the important idea is simpler: every powered component and every conductive path enters a larger electrical relationship. Equipment chassis, branch-circuit grounding conductors, racks, surge devices, coaxial services, antennas, shielded cable, control wiring, and the service grounding system all influence how safely and predictably the system behaves.

When those relationships are correct, grounding becomes nearly invisible. When they are not, the system begins speaking through symptoms.

Hum and buzzAudible evidence that current or voltage differences may be traveling through an unintended path.
Intermittent signalVideo, data, or control failures that appear only when the electrical environment changes.
Equipment stressSurges, faults, and potential differences that can shorten equipment life or create unsafe conditions.
Why It Matters

“Ground loop” has become a junk-drawer diagnosis.

It is often used to describe almost any unexplained noise problem. The phrase is then followed by an isolation transformer, a lifted shield, a cheater plug, or a power conditioner. Sometimes the symptom disappears. That does not prove the underlying condition was understood, and it certainly does not make an unsafe workaround acceptable.

A modern integrated system can contain many conductive paths between the same pieces of equipment. Power grounding conductors, rack rails, HDMI shields, balanced and unbalanced audio connections, Ethernet shields, coaxial cable, antenna systems, and control wiring can all participate. Current follows available paths, not the story printed on the proposal.

Going2Ground is the discipline of tracing the system back to its electrical reference before prescribing a cure.

Where It Fits

Grounding belongs in design, not merely in troubleshooting.

The conversation should begin while the electrical and low-voltage infrastructure can still be coordinated. It matters in equipment rooms, dedicated AV circuits, large residences with subpanels, detached structures, outdoor systems, antenna and coaxial systems, shielded network installations, lighting-control environments, solar-equipped properties, and any project where multiple trades create conductive paths into one integrated system.

Safety firstGrounding and bonding exist first to support safe fault-current paths and protective-device operation. Performance work never outranks life safety.
One coordinated systemA supplementary electrode or isolated-ground receptacle is not permission to create an independent island. Electrical work must remain part of the building’s code-compliant grounding and bonding system.
Measure the right thingElectrode resistance to earth, equipment-grounding continuity, neutral-to-ground voltage, leakage current, and signal-path noise are different measurements answering different questions.
Document before changingA repeatable baseline turns a mysterious service call into an investigation that another professional can verify.
Field Perspective

What a disciplined investigation should examine

The integrator should not perform electrical work outside the limits of licensing and local law. The productive role is to help a qualified electrician understand the AV and network environment, identify every relevant path, and preserve a useful record.

  • Service equipment and the building grounding-electrode system
  • Neutral and equipment-ground separation downstream of the service disconnect
  • Branch-circuit equipment-grounding conductor continuity
  • Subpanels, detached buildings, generators, solar equipment, and transfer systems
  • Racks, metallic raceways, surge-protection devices, coaxial entries, antennas, and satellite systems
  • Shielded data cabling and the manufacturer’s required bonding method
  • Voltage and current differences between interconnected equipment
  • Noise sources that correlate with motors, dimmers, drives, inverters, and large loads
  • Any field modification that defeats a listed safety connection
  • Test results, corrective work, photographs, and an as-built diagram
The Next Move

Investigate in the right order.

  1. Listen to the symptom. Record exactly what happens, when it happens, and what other equipment is operating at the time.
  2. Map every path. Document power circuits, signal cables, shields, racks, surge devices, antennas, coaxial services, subpanels, and other conductive connections.
  3. Bring in the right electrician. Share the system behavior and performance goals without prescribing an unverified electrical remedy.
  4. Measure before modifying. Use the instrument and procedure appropriate to the question being asked. Do not confuse electrode resistance with the continuity of an equipment-grounding path.
  5. Correct safety and code defects first. Never lift a required equipment ground, create an unbonded “clean ground,” or leave a supplementary electrode isolated from the building grounding system.
  6. Retest the complete system. Confirm both electrical integrity and the original AV or network symptom, then preserve the results for the client and future service team.

The most effective noise filter may be the one you never need because the system was understood from the ground up.

Technical and safety note: This episode is an editorial field guide, not an electrical design specification. Electrical work must comply with the adopted edition of NFPA 70, local amendments, equipment instructions, and the authority having jurisdiction, and must be performed by properly qualified and licensed professionals. Never defeat an equipment grounding connection to solve a performance problem.
NFPA 70Fluke Grounding Resources
Loren’s Tech Corner · Episode 05 · Going2Ground · Ideas from the field, traced to the source.