Standard key symbol code in .NET

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Standard key symbol code
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Figure 9.10 illustrates keying levels of control and the rudiments of the standard key symbol code. Great-grand master keys are identified by the letters GGM. Grand masters carry a single letter, beginning with the first in the alphabet and identifying the hierarchy of locks that the individual grand master keys open. Master keys carry two letters; the first identifies its grand mas-
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Figure 9.10 Key levels.
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ter, the second identifies the series of locks under it. Thus, a master key labeled AA is in grand master series A and opens locks in master key series A. Master key AB is under the same grand master but opens locks in series B. Master BA is under grand master B and opens locks in series A. Change keys are identified by their master key and carry numerical suffixes to show the particular lock that they open. Any key in the series can be traced up and down in the hierarchy. Thus, if you misplace change key AB4, you know that master key AB, grand master A, or the great-grand master will open the lock. There are special keys that are out of series. Some of these keys are mentioned in the glossary, together with the appropriate key symbols for them. If cross keying is introduced into the system that is, if a key can open other locks on its level the cylinder symbol should be prefixed with an X. If the cylinder has its own key, it is identified with the standard suffix. For example, XAA4 is a change-key cylinder that is fourth on this level. It may be cross keyed with AA3 or any other cylinder or cylinders on this level. By the same token, master key AA, grand master A, and the great-grand master will open it. Elevator cylinders are often cross keyed without having an individual change key. It is no advantage to have a key that will operate the elevator cylinder and no other in the system. These cylinders are identified as X1X, X2X, and so on. The symbols that involve cross keying apply to the cylinder only; all other symbols apply to the cylinder and the key. This point may seem esoteric, but ignoring it causes the factory and everybody else grief. There is, for example, no such thing as an X1X key. Nor is there an XAA4 key. Change key AA4 fits
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cylinder XAA4 that happens to be cross keyed with another cylinder. Key AA4 does not fit any cylinder except XAA4. There are certain advantages to using the standard key symbol code:
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It is a standardized method for setting up the keying systems. It maintains continuity from one order to the next. It indicates the position of each key and each cylinder in the hierarchy. It helps to control cross keying, since each cross-keyed cylinder is clearly marked. It offers a method of projecting future keying requirements. It can be easily rendered on a chart. It allows better control of the individual keys within the system. It is a simple method of selling and explaining the keying system to an architect or building owner.
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Selling the system
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It is important to be able to communicate the advantages of the key symbol code and the implications it has for setting up an ordered, coherent, and secure keying system. This may take some selling on your part, since architects and building owners tend to think of keys and locks as individual entities and not part of a larger system. Selling a comprehensive masterkeying system involves the following:
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Explaining the subject of masterkeying to the architect or owner Reviewing the plans of the building(s) Choosing the proper level of control required Selecting a keying system that will cover present and future expansion requirements Presenting the system to the architect or owner at a meeting dealing specifically with keying Recording all changes to the system as agreed at the meeting Marking plans with the proper key symbol on the side of each door where the key is to operate Presenting the owner with a schematic layout of the entire system and showing the layout of the masters, grand masters, etc.
Master Key System Variations So far, the structure of the master key system has been discussed. Within this broad structure, there are many opportunities for variations. Some of these variations involve the possible range of keyways; others involve special hardware such as removable cylinders, master-ring cylinders, and rotating tum-
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