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Sneak currents? Never heard the term! Perhaps you mean "leak currents" or "leakage".
Not sure that the term is so applicable in electronics, but in electrical systems, leakage is normally the minute current which flows through the insulation to earth. Normally in microamp range (though many whitegoods, particularly older fridges have leakages up to tens of milliamps).
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[EDIT]
Ok, just googled "sneak current", came up with this, from **broken link removed** :
What is sneak?
Sneak is an unexpected path within a system which, under certain conditions, can initiate an
undesired function or inhibit a desired function.
Sneak is not confined to cars, some famous examples which Boeing research reported as
resulting from unanticipated sneak paths are:
- Missile accidentally launched from B-52 bomber while parked on the ground
- Bombs accidentally released from a B-52
- Nuclear bomb inadvertently armed
- Business jet lost electrical power and drained its batteries without any indication to the
crew while in flight
- Electrical utility lineman electrocuted while working on a power line to which the power
was "off"
- School fire alarms triggered by flushing toilets
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