Modern requirements for security doors, methods of classification are contained in the following regulatory documents: GOST R 51072-97, GOST 50862-96, GOST 51112-97, GOST 50941-96, SNIP 21-01-97, RD 78.147-93 Ministry of the Interior. By definition, these documents: Door protection – is resistant to cracking device consisting of a door frame with a movable blade attached to it, which is in the closed position is fixed in the door frame locking device or locking mehanizmom.Vzlom doors or wooden euro-windows-actions aimed at violating the integrity of the door or the elements of its structure in order to obtain partial or full access to the protected door pomeschenie.Ustoychivost to crack – the ability to resist cracking the door. The magnitude of resistance to cracking Ec is determined experimentally based on the results of testing according to the formula: Ec = k * t + b where k – koeffitsientispolzuemogo tool characterizes his tehnicheskiparametry (mass, dimensions, electrical power, etc.) and the probability of detection produced by imshuma, vibration, smoke, sparks, etc., t – time in ispolzovaniyainstrumenta tests in minutes, b – a so-called base value tool that characterizes the difficulties egodostavki to the site hacking, need for and water, time to prepare for work, etc. Numerical coefficients k and b for various instruments are given in these regulations. If you use multiple tools to break the resistance door EU is the product of time t test at the highest rate k and used the tool to add to this value the amount of the basic values of all used in the experiment instruments.