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208V UPS vs 120V UPS

Discussion in 'Electrical Engineering' started by [email protected], Mar 3, 2009.

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    The following series of UPS has both 120V and 208V versions in capacity sizes
    of 1000VA, 1500VA, 2000VA, and 3000VA:

    But here's the rub. In the 120V versions, they use the following plug sizes
    for the power cord:

    1000VA -> NEMA 5-15P
    1500VA -> NEMA 5-15P
    2000VA -> NEMA 5-20P
    3000VA -< NEMA L5-30P

    No surprise there. However, the 208V versions seem oversized:

    1000VA -> NEMA 6-15P
    1500VA -> NEMA 6-15P
    2000VA -> NEMA L6-20P <-- should only need 6-15P
    3000VA -< NEMA L6-30P <-- should only need 6-20P

    Was someone thinking "inside the box" and associated 2000VA with 20 amp plugs
    and 3000VA with 30 amp plugs?

    One potential argument is that when a UP has been operating from battery for
    a while, and the source power returns, it has to support the connected loads
    AND recharge the battery at the same time. I'd agree that can increase the
    current the UPS draws from the wall receptacle. But this same logic should
    push some of the 120V models into a higher plug current capacity configuration.
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