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Page 379

| Figure A-5 (d) Bushing applications that may be replaced with polymers |

| Polymer insulators permit increased conductor (and static wire) line tensions, resulting in lower construction designs by permitting longer spans, fewer towers or lower tower heights. |

| Polymer one-piece insulators, lacking the flexibility of porcelain strings and the firm attachment of the conductor it support are said to produce a tendency to dampen galloping lines. |

| Although polymer insulation has become increasingly utilized over the past several decades, there are literally millions of porcelain insulated installations in this country alone; economics does not permit their wholesale replacement. Advantage is taken of maintenance and reconstruction of such facilities to make the change to polymers. |

| Much of the data and illustrations are courtesy of Hubbell Power systems, and is herewith duly acknowledged with thanks. |

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