2007 VVSG-OF

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Testing SHALL be conducted by applying gradual steps of overvoltage across the line and neutral terminals of the voting system unit.

Applies to: Electronic device

DISCUSSION

Testing for sag immunity within the context of EMC is not necessary in view of Requirement Part 1: 6.3.4.3-A.4 that the voting system be provided with a two-hour back-up capability (to be verified by inspection). Testing for swells and permanent overvoltage conditions is necessary to ensure immunity to swells (no loss of data) and to permanent overvoltages (no overheating or operation of a protective fuse).

A) Short-duration Swells

As indicated by the ITI Curve [ITIC00], it is necessary to ensure that voting systems not be disturbed by a temporary overvoltage of 120 % normal line voltage lasting from 3 ms to 0.5 s. (Shorter durations fall within the definition of “surge.”)

B) Permanent Overvoltage

As indicated by the ITI Curve [ITIC00], it is necessary to ensure that voting systems not be disturbed nor overheat for a permanent overvoltage of 110 % of the nominal 120 V rating of the voting system.

Source: New requirement

Overvoltage spec

c r williams (EE) on 02.28.08 at 6:22pm

\\\"... permanent overvoltage of 110% of the nominal 120 V rating ...\\\"

A 110% overvoltage could mean that the total applied voltage is 120 v plus 110% of 120 v, or (120 + 132) v for 252 v total.

I hope this is not what is meant.

It would be good to clarify this, perhaps just stating what the total \\\'permanent withstand\\\' voltage is for a nominal 120 v supply. (I\\\'m guessing 132 v?)

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