Transfer switch applications typically require a plant exerciser once a week or once a month. Table 2 demonstrates the life expectancy operating the UL 1008 switch once a week for the life of the switch. ATS RATING (AMPERES) RATE OF OPERATION PER MINUTE WITH CURRENT WITHOUT CURRENT TOTAL 0 – 300 1 6000 — 6000 301 – 400 1 4000 — 4000 401