One of the plant's four plant air compressors blew a 100A fuse. The other two fuses are OK. After a few incidents where "blind fuse replacement" resulted in equipment damage, the plant engineer issued a memo stating that no fuse will be replaced until a determination has been made as to why it blew. Unfortunately, the memo didn't include instructions, and the maintenance department hasn't developed a checklist. Your DMM doesn't show a direct short. If the fuse blew due to a random event, you could be here all day running tests.
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