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DOE-HDBK-1092-2004
When metallic cable tray is being used, it shall be bonded to the equipment grounding system,
but should not be relied upon to provide the equipment ground. The experimental equipment
must be appropriately grounded by some other method.
10.9.1.3 OPERATION AND MAINTENANCE
The operation and maintenance of R&D systems which use wiring methods that are not
anticipated by the NEC require special considerations from all personnel. The AHJ evaluation
for safe operating conditions must include a review of unique features in the engineering
documentation.
10.9.2 UNCONVENTIONAL PRACTICES
R&D performed by DOE contractors often incorporates the design of specialized equipment
resulting in the need for specialized grounding and the use of materials and components in an
unconventional  manner.  Even  with  these  experimental  needs  and  special  design
considerations, the maximum safety of personnel and equipment still needs to be ensured. The
practice of using materials or components for purposes other than originally designed needs
special consideration in their use, identification, personnel protection, and equipment protection.
10.9.2.1 GROUNDING
10.9.2.1.1 HAZARDS
The lack of proper grounding can cause electrical shock and/or burns to personnel. The NEC
and NESC define legally-required grounding. To mitigate potential hazards, grounding shall be
provided in accordance with the NEC and NESC.
10.9.2.1.2 DESIGN AND CONSTRUCTION
NEC, Article 250, "Grounding" notes that grounds also provide:
1. Voltage limitation in case of lightning, line surges, or unintentional contact with higher
voltage lines
2. Stability of voltage to ground under normal operation
3. Facilitated overcurrent device operation in case of ground faults
4. A path to conductive objects that will limit the voltage to ground.
In R&D work there is one additional function for grounds: a common reference plane or system
ground return for electronic devices, circuits, and systems. (See Section 9.3) It is recognized
that such grounds are essential in some cases to control:
1. Noise associated with the primary power system:
a. Incoming on the line
b. Outgoing from local equipment
2. Ground wire noise
10-15


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