NY -- Standard&Poor's CreditWire 1/7/98 -- Standard&Poor's today assigned its preliminary single-'A'-minus senior unsecured debt rating to Tyco International Ltd.'s $2 billion shelf registration. A single-'A'-minus corporate credit rating was also assigned. At the same time, Standard&Poor's affirmed its single-'A'-minus corporate credit, bank loan, and senior unsecured debt ratings on Tyco International (US) Inc., a wholly owned subsidiary of Tyco International Ltd. The outlook is stable. The ratings reflect the strengthening of Tyco's business profile over the past few years, as it has diversified away from purely construction-related businesses and established leading positions in fire and safety services, disposable and specialty products, flow control, and electronic components. This represents a shift to more stable,