What Is Line-of-Sight Concealment During Audits? (Shielding Rules)
Line-of-sight concealment during an audit means limiting casual views for privacy without blocking an authorized auditor’s required view, access, or inspection. A compliant screen must not reduce code-required clearances or obstruct egress, ventilation, fire protection, or equipment service. Confirm the audit scope, adopted codes, permit conditions, and equipment instructions before installing any screen.
A quick fix is to remove or reposition a screen that sits in a required clearance, then measure the space again. A tidy visual barrier is not compliant just because people can still walk past it. The relevant question is whether authorized staff can safely reach and inspect what the audit requires.
Planning the Audit-Compliant Privacy Screen
A privacy screen may limit casual views of a work area, but it cannot hide required records, equipment, conditions, or inspection points from an authorized auditor. There is no single rule that approves every screen. Start with the audit scope, then check adopted codes, permit documents, equipment instructions, and site-specific requirements.
Define what the audit must see
First, ask the audit owner what areas, devices, and records are in scope. An audit may require a clear view of a panel label, a service point, a safety device, or an entire work area. Do not assume that a screen is acceptable because it leaves a walking path open.
For this guide, line-of-sight concealment means limiting an unintended or casual view while preserving the authorized view and access required for inspection. It does not mean hiding conditions from an auditor, inspector, or required camera.
I use a simple test: if the auditor must move, open, or remove something that is not part of the approved inspection process to see the item, the screen may be in the wrong place. Get written approval when the audit requirements are unclear.
Survey the space before measuring
Record the location of electrical equipment, doors, exits, accessible routes, air grilles, alarms, sprinklers, and inspection points. Note which way equipment doors open and where technicians need to stand. Photograph existing conditions before work begins.
Then mark the proposed screen footprint on the floor or plan. This makes it easier to compare the proposed layout with required working spaces and access routes before choosing materials.
Access, Egress, and Required Clearances
A screen is acceptable only if it leaves each required access and safety zone intact. Measure the actual clear space after installation, not just the apparent walking path. Electrical working space, accessible routes, door openings, airflow, and fire-protection access may follow different rules.
Electrical panel working space
NEC 110.26 sets working-space requirements around electrical equipment likely to need examination, adjustment, servicing, or maintenance while energized. The adopted NEC edition and local amendments control. Confirm voltage to ground, opposing surfaces, equipment dimensions, and door swing before applying a measurement.
For equipment operating at 0–150 volts to ground, the minimum working-space depth is 3 feet under Condition 1. Other conditions require 3.5 or 4 feet. The required width is at least 30 inches or the equipment width, whichever is greater. The space must allow the equipment door to open at least 90 degrees.
Required working-space height is at least 6.5 feet or the equipment height, whichever is greater. Do not put a screen, trim, or storage inside this space. A screen that looks small can still reduce required depth or stop the panel door from opening fully.
| Check | General threshold or rule | What to verify |
|---|---|---|
| Electrical working depth | 3 ft for 0–150 V to ground, Condition 1; 3.5 ft or 4 ft for other conditions | Voltage, opposing surface, adopted NEC edition |
| Electrical working width | 30 in. or equipment width, whichever is greater | Clear width and 90° door opening |
| Electrical working height | 6.5 ft or equipment height, whichever is greater | Clear height above the working space |
| Accessible route | Generally 36 in. minimum under the 2010 ADA Standards | Applicable exceptions and site conditions |
| Door clear opening | Generally 32 in. minimum with door open 90° | Actual clear opening, not nominal door size |
| Airflow and device clearance | Follow equipment instructions and applicable requirements | Grille free area, service clearance, fire devices |
Accessible routes and doors
The 2010 ADA Standards generally call for a 36-inch minimum accessible route width under §403.5.1 and a 32-inch minimum clear door opening under §404.2.3, measured with the door open 90 degrees. Exceptions and existing-building conditions can apply, so do not treat these figures as a substitute for checking the applicable standard and project requirements.
Measure the narrowest point along the route, including the space left after the screen is installed. Check door hardware, turns, and the clear opening. A route that meets its width at one point may still be blocked elsewhere.
Airflow and fire protection
There is no universal CFM value or screen offset that works for every room or piece of equipment. Use the equipment listing and manufacturer instructions for ventilation and clearance requirements. Keep required grille free area open, and do not block air intakes or returns.
Keep alarms, sprinklers, and other fire-protection devices visible and unobstructed. Their required clearances depend on the device and applicable rules. Confirm the layout with the responsible facilities or fire-protection contact rather than guessing at a distance.
Screen Installation and Finishing
A compliant screen should be stable, suitable for its location, and outside all required clearances. Choose a noncombustible material or another material allowed by the applicable code and project documents. Where inspection or maintenance is required, keep access plainly visible and make the screen removable if approved.
Choose a location and attachment method
Place the screen only after marking the measured clearance zones. Avoid attaching it to equipment, access panels, or building components not designed to carry the added load. If the screen is near a door, verify that the door can open to the required position without hitting it.
Use a secure attachment method suited to the wall, floor, or ceiling structure. Check for concealed utilities before drilling. If the installation changes a rated assembly, affects a sprinkler or alarm, or requires a permit, pause and consult the responsible professional or authority.
Finish without hiding inspection points
A neat finish can support privacy, but it must not make required access hard to identify. Do not cover labels, inspection doors, valves, shutoffs, or equipment identifiers that the auditor or service worker needs to see. Use visible access panels where the design requires them.
Before final approval, open each door and panel through its full operating range. Check that the screen stays stable and does not shift into a required space. Record the finished dimensions and access points.
Inspection, Documentation, and Verification
Verification is a measured check that the finished screen still meets the approved layout and leaves required access available. Keep a short record of dimensions, photos, approvals, and equipment instructions. This helps the audit team review the installation without relying on memory or appearance alone.
Measure and test the finished installation
After installation, repeat the measurements from the planning stage. Measure electrical working depth, width, and height at the tightest point. Test the equipment door to at least 90 degrees where required. Check the accessible route and door opening at their narrowest points.
Then confirm that air grilles remain open and that fire-protection devices and inspection points remain visible and reachable. If the screen is removable, confirm that approved staff can remove it without damaging equipment or blocking an exit.
A modest screen can still make a panel noncompliant by cutting into working depth or limiting the door swing. Measuring only the walking path does not establish electrical working-space compliance.
Keep an audit-ready record
Save dated photos from the approach, the work area, and the equipment itself. Include measured clearances, material details, relevant equipment instructions, and written approvals. Note the code edition or project requirement used for each measurement when known.
If any measurement fails, do not rely on a verbal explanation that the screen is “temporary.” Reposition or remove it, then repeat the checks and update the record.
Example Audit Scenarios
These examples show how to apply the checks; they are not code approvals for a specific building. Actual compliance depends on the adopted rules, equipment, and audit scope. Use the same sequence for each case: define the required view, measure clearances, install outside them, and verify.
Screen near an electrical panel
A homeowner proposes a freestanding divider to limit views into a utility area. The divider appears to leave a clear walkway, but it sits within the measured panel working depth and prevents the equipment door from opening 90 degrees. The correct response is to move or remove the divider, then remeasure the working space.
This example shows why visual openness is not enough. Panel access is a separate requirement from general passage.
Screen beside an inspection route
A tradesperson adds a short privacy panel near a service room. The route looks wide at the entrance, but the panel narrows it farther along. The installer should measure the narrowest point, confirm the applicable accessible-route requirement, and obtain approval before treating the layout as complete.
Screen near an air grille or sprinkler
A screen is proposed near a return grille and a sprinkler. There is no universal spacing number to apply to both. Check equipment instructions and the applicable fire-protection requirements, then ask the responsible facilities or fire-protection contact to review the layout.
FAQ: Audit Line-of-Sight and Screening Rules
These answers give general planning guidance, not a site-specific code ruling. The adopted code, permit documents, audit scope, equipment instructions, and local authority determine the final requirements. When they conflict or remain unclear, seek written direction before installation.
What does line-of-sight concealment mean during an audit?
It means limiting casual views while preserving an authorized auditor’s required view and access. It does not permit hiding required equipment, records, or conditions.
Can a privacy screen be placed near an electrical panel?
Only if it stays outside the required working space and does not limit the required door opening. Verify dimensions under the adopted NEC edition.
How deep is electrical working space?
For equipment at 0–150 volts to ground, Condition 1 requires 3 feet. Other conditions require 3.5 or 4 feet. Confirm the actual conditions before using these values.
How wide must the electrical working space be?
At least 30 inches or the equipment width, whichever is greater. The equipment door must also open at least 90 degrees.
Does every privacy screen need a fixed airflow gap?
No universal gap or CFM value applies to all screens. Follow the equipment’s listing and manufacturer requirements, and keep required grille area clear.
Can a screen cover an inspection panel if it is removable?
Not unless the audit owner and applicable requirements allow that arrangement. Required access should remain plainly available to authorized staff.
What should I document after installation?
Record photos, finished measurements, access checks, relevant instructions, and approvals. Include the code edition or project requirement used when known.
Who should approve a proposed screen?
Ask the audit owner and, as relevant, facilities staff, the authority having jurisdiction, and fire-protection or accessibility professionals. The right reviewer depends on the equipment and site.
What is the first step if a screen reduces a required clearance?
Stop using that layout. Move or remove the screen, remeasure the affected area, and document the corrected installation before the audit.
(This article was written by one of our staff writers, Garrett Vance. Visit our Meet the Team page.)
