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(7) Terminals and connections. Terminals should be checked to ensure that they are secure. Connections showing evidence of heat should be cor­rected as a high-resistance contact is indicated.

(8) Interrupting elements. Load interrupter switches are equipped with an interrupter element, designed to quench the arc that results when the switch is opened under loaded conditions. Basically, these elements are shunt devices, installed as part of the switch, through which current passes only as the switch is opened. In some designs the arc quenching medium is air, but for the higher voltage

8-5

TM 5-684/NAVFAC MO-200/AFJMAN 32-1082

switches the interrupter may use some other me­dium, such as sulfur hexifluoride gas. Interrupters should receive the same inspection and mainte­nance as the switches on which they are installed. Many interrupter switches are designed so that ma­terial is consumed from the walls which are exposed to the electric arc. Particular attention should be given to such parts, and they should be maintained or replaced in accordance with the manufacturer's

instructions. Interrupter contacts should be in­spected for damage caused by arcing. Contacts showing evidence of excessive wear should be re­placed in accordance with manufacturer's recom­mendations.

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