The design of the porcelain suspension insulator ANSI 52-8 has aimed to produce a theoretically correct insulator as practical as possible. The marked distinguishing feature of the new unit is its great thickness of dielectric and the perfectly balanced field of stress due to the identical metal electrodes above and below.

                             
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Porcelain suspension insulator ANSI 52-8 design:
The stress on the porcelain suspension insulator ANSI 52-8 under all operating conditions is correspondingly lower than on the thinner types. The critical stress varies with the specific inductive capacity of the material; for porcelain, the safe potential gradient is about 40,000 volts per inch of thickness. The one porcelain suspension insulators ANSI 52-8 piece, as proved by tests, both on normal and high frequency, avoids corona up to limited volts. The manufacturer believes the new unit will insulate permanently, because of its safe dielectric stresses. The perfectly balanced field is also very important in securing the full value of the insulating material and enabling the insulator to resist high frequency and other line conditions caused by lightning and switching. In the cap and pin type the area of contact with cement outside is six or seven times that in the pin hole, causing a greatly concentrated stress on the porcelain next the pin hole.

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