Publication: Street Railway Journal
New York, NY, United States
HIGH-TENSION STRAIN INSULATORS
The development of high-tension trolley lines has created the need for a type of strain insulator that will satisfactorily meet the new and more difficult requirements. With this demand in mind, the Locke Insulator Manufacturing Company, of Victor, N. Y., has brought out its No. 601 strain insulator, illustrated, which is 6 ins. high and 5 3/4 ins. in diameter, designed for voltages up to 8000. The company has also developed a smaller design strain insulator for voltages of s000 and under, and finds that it is very useful in the construction of spans for trolley suspension; in fact, this latter type has proved to be valuable in more places than the manufacturer anticipated.
In this connection it might be of interest to note that the Locke Insulator Manufacturing Company has developed a complete line of strain insulators for tensions up to 35,000 volts, and is developing a new design which will be capable of withstanding voltages of 60,000 or more. The company has experimented considerably with these designs in regard to their mechanical strength, and finds that the larger insulators can be relied upon to stand a break-down test of approximately 12,000 lbs. with the insulator supported by a pin passing through the middle and the strain applied around the middle wire groove. In connection with these insulators, the manufacturer has developed a method of using them whereby almost any strain up to several tons may be applied with entire safety.