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Combined Resistance Budget
DoD Manual 4145.26 limits the combined resistance of the person’s body, conductive shoes, and floor-to-ground path to 1,000,000 ohms (1 MΩ). The limit does not apply to the floor alone.
These provisions come from the DoD Contractor’s Safety Manual for Ammunition and Explosives, dated 13 March 2008 and incorporating Change 2 of 31 August 2018.
How the shared resistance limit works
- Clause
- C6.4.7.5.1
- Combined max
- 1,000,000 ohms
Paragraph C6.4.7.5.1 permits different maximums for the floor-to-ground path and the person’s body plus shoes, provided their combined resistance does not exceed 1,000,000 ohms.
The manual gives this example:
| Part of the grounding path | Maximum resistance in the example |
|---|---|
| Floor to the ground system | 500,000 ohms |
| Person’s body plus conductive shoes | 500,000 ohms |
| Combined path | 1,000,000 ohms |
The equal split is an example, not a required allocation. The controlling requirement is the combined limit.
Minimum resistance still applies
- Clause
- C6.4.7.5.2
The allocation does not remove the separate minimum-resistance provision in C6.4.7.5.2. Floor-to-ground and tabletop-to-ground resistance must each:
- Exceed 40,000 ohms in areas with 110-volt service.
- Exceed 75,000 ohms in areas with 220-volt service.
A ground fault interrupt circuit also meets this minimum-resistance requirement.
The DoD conductive-floor guide puts these resistance requirements alongside the footwear checks, floor-testing schedule, and installation requirements.
Frequently asked questions
No. DoD Manual 4145.26 C6.4.7.5.1 gives that split as an example. Different maximums may be set for the floor-to-ground path and the person’s body plus conductive shoes, provided their combined resistance does not exceed 1,000,000 ohms.
No. DoD Manual 4145.26 C6.4.7.5.2 separately requires floor-to-ground and tabletop-to-ground resistance to exceed 40,000 ohms in areas with 110-volt service and 75,000 ohms in areas with 220-volt service. A ground fault interrupt circuit also meets this minimum-resistance requirement.
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