This specification covers one type of lightweight field and mobile shelter designed for transport by cargo truck, fixed or rotary winged aircraft, by rail, and ship, designated as Shelter, Electric Equipment S-250/G. The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only. The following safety hazards caveat refers only to the test methods portion of this specification. This standard does not purport to address the safety concerns, if any, associated with its use. It is the responsibility of the user of the standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.