Chapter 6-Electrical and Electronics Prints

Blueprint Reading and Sketching - Intro to drafting and architecture practices
Page Navigation
59

CHAPTER 6 ELECTRICAL AND ELECTRONICS PRINTS When you have read and understood this chapter, you should be able to answer the following learning objectives. Describe shipboard electrical and electronics prints. Describe aircraft electrical and electronics prints. Explain basic logic diagrams on blueprints. This chapter is divided into two parts: electrical prints and electronics prints. Each part deals with the use of prints on ships and aircraft. ELECTRICAL PRINTS A large number of Navy ratings may use Navy electrical prints to install, maintain, and repair equip- ment. In the most common examples, Navy electrician’s mates (EMs) and interior communica- tions electricians (ICs) use them for shipboard electrical equipment and systems, construction electricians (CEs) use them for power, lighting, and communications equipment and systems ashore, and aviation electrician’s mates (AEs) use them for aircraft electrical equipment and systems. These prints will make use of the various electrical diagrams defined in the following paragraphs. A PICTORIAL WIRING DIAGRAM is made up of pictorial sketches of the various parts of an item of equipment and the electrical connections between the parts. An ISOMETRIC WIRING DIAGRAM shows the outline of a ship or aircraft or other structure, and the location of equipment such as panels, connection boxes, and cable runs. A SINGLE-LINE DIAGRAM uses lines and graphic symbols to simplify complex circuits or systems. A SCHEMATIC DIAGRAM uses graphic symbols to show how a circuit functions electrically. An ELEMENTARY WIRING DIAGRAM shows how each individual conductor is connected within the various connection boxes of an electrical circuit or system. It is sometimes used interchangeably with SCHEMATIC DIAGRAM, especially a simplified schematic diagram. In a BLOCK DIAGRAM, the major components of equipment or a system are represented by squares, rectangles, or other geometric figures, and the normal order of progression of a signal or current flow is represented by lines. Before you can read any blueprint, you must be familiar with the standard symbols for the type of print concerned. To read electrical blueprints, you should know various types of standard symbols and the methods of marking electrical connectors, cables, and equipments. The first part of this chapter discusses these subjects as they are used on ships and aircraft. SHIPBOARD ELECTRICAL PRINTS To interpret shipboard electrical prints, you need to recognize the graphic symbols for electrical diagrams and the electrical wiring equipment symbols for ships as shown in Graphic Symbols for Electrical and Electronic Diagrams, ANSI Y32.2, and Electrical Wiring Equipment Symbols for Ships’ Plans, Part 2, MIL-STD-15-2. Appendix 2 contains the common symbols from these standards. In addition, you must also be familiar with the shipboard system of numbering electrical units and marking electrical cables as described in the following paragraphs. Numbering Electrical Units All similar units in the ship comprise a group, and each group is assigned a separate series of consecutive numbers beginning with 1. Numbering begins with units in the lowest, foremost starboard compartment and continues with the next compartment to port if it contains familiar units; otherwise it continues to the next aft compartment on the same level. Proceeding from starboard to port and from forward to aft, the numbering procedure continues until all similar units on the same level have been numbered. It then continues on the next upper level and so on until all similar units on all levels have been numbered. Within each compartment, the numbering 6-1

Privacy Statement
Press Release
Contact