About liquidation even without leverage

In a margin account Is it possible to have positions liquidated even without using margin? Let's say i have $10,000 and buy 100 IBM at $100, if IBM falls to $50 do i get liquidated even though iam not using leverage? I know it wouldn't happen in a cash account but how about a margin account?
 
there is no such thing as maintenance margin in an account that doesn't use leverage ...

When you go to tws there is a value in maintenance margin even without using leverage but maybe the IB algorithm doesn't take it into account when all positions are fully paid for.
 
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