OVATION 1C31197G01 Analog output board

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Measure resistance of all bonds between metallic-cable sheathing and its ground path. Resistance higher than one-half ohm indicates a deficiency. (9) All methods of measuring ground resistance are similar in that a suitable source of current is necessary. Auxiliary reference grounds and test instruments are necessary for American National Standards Institute (ANSI)/Institute of Electrical and Electronics Engineers (IEEE) ANSI/IEEE 80, IEEE Guide for Safety in AC Substation Grounding, methods. The following methods are suitable for measuring the resistance of isolated ground rods or small grounding installations. Precision in measurements is difficult to obtain. Normally an accuracy of 25 percent is sufficient, since the surrounding soil will not have consistent values of temperature, moisture, and depth.

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