ANSI ESD-S6.1-2005 pdf download For the Protection of Electrostatic Discharge Susceptible Items Grounding
5.3.4 Vehicles The electrical system of vehicles such as ships, aircraft, space craft and surface vehicles have a self-contained electrical system that utilize a neutral bus with equipment grounding conductors that serve as an electrically zero reference point. A vehicular grounding system is acceptable for establishing an EPA within the vehicle and is within the scope of this standard.
5.3.5 Mechanical Requirements Wires used as the conductor for electrical bonding between ESD technical elements and the common point ground or a common connection point, and from the common point ground to the ESD grounding/bonding reference point, shall be of sufficient strength not to be inadvertently broken or disconnected. The wire shall be electrically insulated and, whenever possible, mechanically supported to physical structures to limit mechanical damage.
6.0 ELECTRICAL REQUIREMENTS
6.1 Instrumentation
6.1 .1 DC Ohmmeter The meter shall be capable of measuring a DC resistance of 0.1 ohm through 1 megohm (or other added resistance value) with an accuracy of ±1 0% of the value being measured.
6.1 .2 AC Circuit Tester (Impedance Meter) The meter shall be capable of measuring the impedance of the equipment grounding conductor from a receptacle (power outlet used for establishing the AC equipment ground) to the neutral bond at the main service equipment panel. The meter shall also verify wiring orientation.
6.2 Verification Frequency The grounding system must be verified periodically at the frequency established in a user defined ESD Control Program Plan.
6.2 ESD Grounding System Verification
6.3.1 Equipment Grounding Conductor The impedance of the equipment grounding conductor from a receptacle (power outlet used for establishing the AC equipment ground) to the neutral bond at the main service equipment panel shall not be greater than 1 ohm. The hot, neutral, and equipment grounding conductor shall be verified to be in the proper wiring orientation in accordance with the National Electric Code (ANSI/NFPA-70). See Figures 5 and 6.
6.3.2 AC Equipment Ground and Auxiliary Ground Verification If both grounding systems are present, the resistance between the AC and the auxiliary ground shall be <25 ohms. See Figure 2. 6.4 Technical Elements ESD technical elements directly connected to the ESD grounding/bonding reference point shall be measured from the groundable point of the ESD technical element to the ESD grounding/bonding reference point.