Our margin rules:
Margin Call: 100%
Stop Out level: 70%
If you reach 100% you will get a margin call and you will not be able to open any trades.
If you reach 70% Margin or below, a Stop-Out will occur at which MetaTrader will start to close your open positions one by one to prevent further losses that will lead you to a negative balance (below 0 USD).
Your largest negative trades will be closed automatically to avoid running your account into a negative balance.