. Cyclopedia of applied electricity : a practical guide for electricians, mechanics, engineers, students, telegraph and telephone operators, and all others interested in electricity . 88» INSULATORS tor will puncture more readily when it is exposed to severe ineeban-ical stress hy the expansion of the iron pin on which it is mounted. Tests of insulators are usually made with alternating current,and the form of the voltage curve is important, especially wherethe test is made to determine what voltage will arc over the surfaceof the insulator from the line wire to the pin. The square root ofthe
. Cyclopedia of applied electricity : a practical guide for electricians, mechanics, engineers, students, telegraph and telephone operators, and all others interested in electricity . 88» INSULATORS tor will puncture more readily when it is exposed to severe ineeban-ical stress hy the expansion of the iron pin on which it is mounted. Tests of insulators are usually made with alternating current,and the form of the voltage curve is important, especially wherethe test is made to determine what voltage will arc over the surfaceof the insulator from the line wire to the pin. The square root ofthe mean square for twocurves of alternating vol-tage, as read by a volt-meter, may be the samethough the maximum volt-ages of the two curvesdiffer widely. In tests forthe puncture of insulators,the average alternatincrvoltage applied is moreimportant than the maxi-mum voltage shown by thehighest points of the pres-sure curve, because of theinfluence of the time ele-ment with glass and porce-lain. XJn the other hand,when the test is to deter-mine the average voltage atwhich current will arc overthe insulator surface fromthe line wire to the pin, themaximum value of the pres-sure
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