Two-point bonding measurements test establishment of a reference for the power source.

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Grounding provides a defined reference potential for the electrical system by tying it to earth. Two-point measurements verify that there is a continuous, low-impedance path from the system’s equipment grounding conductor to the grounding electrode (or other earth reference points). This confirms that the power source has a stable reference and that fault currents will have a clear path to earth, enabling protective devices to operate reliably. Bonding is about keeping conductive parts at the same potential to reduce hazardous differences, but it isn’t about establishing the earth reference itself. Shielding and insulation do not create a ground reference; shielding handles EMI, insulation prevents contact. So, this test describes grounding.