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52.3.2 Electrical Clearance Electrical clearance of hardware to components or electrical traces must be controlled by the design based on the expected voltage and environment s exposure.As a default, design standards

such as IPC-2221 create a spacing requirement unless it is specifically defined for the particular PCBA (see Fig. 52.10 for examples). Minimum electrical clearance can be referenced throughout the acceptability requirements such as with contaminants or board laminate defects related to the conductors. Any violation of minimum electrical clearance is cause for a defect disposition consideration for any class, since it will directly impact the electrical performance of the product. Any condition that compromises the clearance should be verified by assemblers or inspectors to ensure that a shorting condition does not occur.

When you rehearse alone and hear yourself saying um in a video, try these two techniques to break the habit: (1) Breathe in every time you normally say um. You can t make the noise when you inhale. (2) Close your mouth when you would usually say um. You can still make the noise, but just changing your mouth position will stop you from making the sound. You ll feel very silly doing these exercises, but they work! Before it s showtime, make sure you do at least one more recorded performance, practicing your new and improved style. It s important for you to see that you look and sound better. It s almost a guarantee that you ll improve between the rst and second recordings if you make the effort. How others perceive you is critical in your interaction. Perception may not be accurate, but to the perceiver, it is reality. Your rst impression may color your relationship with this individual for months to come.

FIGURE 52.10 Examples of acceptable and unacceptable electrical clearance-hardware. (a) Acceptable where: (1) Metallic hardware; (2) Conductor pattern; (3) Specified minimum electrical clearance; (4) Mounted component; (5) Conductor; (b) Unacceptable where hardware reduces clearances to less than specified electrical clearance; (1) Metallic hardware; (2) Conductor pattern; (3) Spacing less than minimum electrical requirements; (4) Mounted component; (5) Conductor; (c) Unacceptable as lead is clinched toward a noncommon electrical conductor (1) and violates clearance; (C) requirement.

Physical Damage Physical damage to hardware components in most cases refers to enough damage to a component to render it unusable in its application for example, threads that are damaged to the point that mechanical fastening cannot be performed or a component that is fractured or broken such that it cannot perform the function for which it was intended. Subjective judgments are common in this area since it is very much dependent on the application of the hardware in the given design, the environment in which the final product will be used, and life cycle expectations of the product.

Component installation or placement is the first step in the assembly of the PCBA. It may begin by preparation of the leads of a given package type in order to provide the correct lead

protrusion, form the leads to fit the PCB plated-through holes or pads, or put a bend in the leads that will serve as a standoff from the component to the PCB.

Plated-Through Hole (PTH) Lead Installation Several requirements apply to all PTH components. When using a polarized component, it must be oriented correctly. In all cases, if the orientation is incorrect, the board is unacceptable (see Fig. 52.11).When lead forming is required, the lead form must provide clearance and

FIGURE 52.11 Component orientation polarity. (IPC)

stress relief (see Fig. 52.12). Physical damage to the lead itself cannot exceed 10 percent of the diameter of the lead. Exposed basis metal as a result of lead deformation is a process indicator but does not render the board unacceptable. 52.4.1.1 Axial Leaded Components. The target condition for axial components is that the entire body length of the component should be parallel and in contact with the board surface (see Fig 52.13 for tolerances). If the component is required to be spaced above the board to avoid overheating the laminate, it must be mounted a minimum of 1.5 mm above the PCB surface.The maximum space between the component and the PCB surface should not violate the requirements for lead protrusion and cannot be greater than 3.0 mm for Class 1 and 2 and 0.7 mm for Class 3 equipment (see Fig. 52.13). Leads must extend from the component body at least one lead diameter (L) or thickness, but not less than 0.8 mm from the body or weld, before the start of the lead bend radius (see Fig. 52.14).