DA Form 7452-3-R PDF: Signal Ground Checklist (New Facilities)

DA Form 7452-3-R PDF: Signal Ground Checklist (New Facilities) – DA Form 7452-3-R is the Signal Ground Reference Subsystem Checklist for New Facilities (LRA). U.S. Army personnel use this form to inspect, verify, and document the installation of the signal reference (or signal ground) subsystem in new Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) facilities.

The form dates to February 2002 and references TM 5-690, Grounding and Bonding in C4ISR Facilities (15 February 2002), published by the U.S. Army Corps of Engineers (COE). It serves as a key tool for electrical inspectors, engineers, and contractors ensuring compliance during construction and acceptance testing of new facilities.

Download the official DA Form 7452-3-R PDF here: https://armypubs.army.mil/pub/eforms/DR_a/pdf/A7452_3_R.pdf

Why Signal Ground Reference Subsystems Matter in C4ISR Facilities?

Modern military facilities handle highly sensitive electronics, data communications, and mission-critical systems. The signal ground reference subsystem (also called signal reference subsystem or SRS) provides a low-impedance, equipotential reference for electronic equipment. This minimizes:

  • Electromagnetic interference (EMI)
  • Noise coupling in signal and data lines
  • Ground loops that can corrupt sensitive signals
  • Risks to TEMPEST (compromising emanations) protection and EMP hardness

It complements other grounding subsystems:

  • Earth electrode subsystem (for lightning and safety)
  • Fault protection subsystem (safety grounding)
  • Lightning protection subsystem

Proper implementation ensures reliable operation of communications, computers, and intelligence systems while supporting overall facility grounding and bonding per TM 5-690 guidelines.

Key configurations often include single-point grounding or multi-point/signal reference grids to control high-frequency currents and maintain signal integrity.

How to Use DA Form 7452-3-R?

Inspectors complete the form during construction and final acceptance of new facilities. Main sections include:

  1. Facility Identification — Name, date (YYYYMMDD), location, and inspector details.
  2. Layout Sketch — Sketch the actual signal ground reference subsystem layout or attach up-to-date engineering drawings.
  3. Component Verification — Check all signal ground components for proper sizes, types, and materials as specified in the design. Record any deficiencies.
  4. Connections and Bonding — Verify proper connections, bonding, and continuity. Document discrepancies.
  5. Resistance Measurements — Perform and record resistance measurements at test points (using a double balanced DC bridge for joint connectors).

The form ensures systematic inspection so the subsystem meets design specifications for performance, safety, and electromagnetic compatibility.

Tip: Always reference the latest project drawings and TM 5-690 for detailed acceptance criteria.

This checklist is part of a family of forms for comprehensive grounding and bonding inspections:

  • DA Form 7452-R — Earth Ground Electrode Subsystem (New Facilities)
  • DA Form 7452-1-R — Ground Fault Protection Subsystem (New Facilities)
  • DA Form 7452-2-R — Lightning Protection Grounding Subsystem (New Facilities)
  • Separate forms exist for existing facilities (e.g., DA Form 7452-8-R for signal ground reference in existing buildings)

These support a complete inspection program for new and legacy C4ISR infrastructure.

Best Practices for Signal Grounding in Army Facilities

  • Use approved materials and follow specified bonding techniques.
  • Minimize ground potential differences across equipment.
  • Ensure integration with overall facility grounding without compromising safety or lightning protection.
  • Document everything thoroughly for configuration control and future maintenance.
  • Schedule regular verification as part of broader facility acceptance and sustainment programs.

Contractors and Army engineers working on new builds in the United States should prioritize these checks to avoid costly rework and ensure mission readiness.

Download and Resources

  • Official Form: DA Form 7452-3-R PDF
  • Primary Reference: TM 5-690 – Available via official Army publications channels (e.g., armypubs.army.mil or WBDG).