The day trade margin rules are as follows for retail accounts:
Let's use the previous example of an equity balance of $10,000 in the account. If you buy 3000 shares @ $10, the equity value will equate to $30,000. A maintenance requirement for a long position is 25% of the equity value. So in this case, $30,000 * .25 = $7,500. You would have to keep the equity value of your account above $7,500 to avoid a margin call.
For short positions, the value is 30%. $30,000 * .30 = $9,000. You would have to keep the equity value of your account above $9,000 to avoid a margin call.
If you are looking for more leverage and "extended" margin call requirements, you should consider going prop.
Thanks