PCB Regulatory Frameworks & Compliance 3 â Questions and Answers
Question 1: What is the primary purpose of the REACH regulation in the context of PCB design?
- Restricting electromagnetic emissions
- Controlling registration and evaluation of chemical substances (Correct answer)
- Mandating end-of-life recycling
- Setting minimum trace width requirements
Correct answer: Controlling registration and evaluation of chemical substances
REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals) requires manufacturers to identify and manage risks from chemicals used in products including PCBs.
Question 2: A PCB design engineer adds copper fill to reduce impedance and minimize EMI. Which FCC test limit category applies to a device sold commercially in the US for home use?
- Class A (industrial)
- Class B (residential) (Correct answer)
- Class C (medical)
- Class D (automotive)
Correct answer: Class B (residential)
FCC Part 15 Class B limits apply to devices marketed for residential use and are stricter than Class A industrial limits.
Question 3: Under IPC Class 3 requirements, what must be done to conformal coating voids discovered during inspection?
- They are acceptable if under 1 mm diameter
- They must be documented but not repaired
- They are rejectable defects requiring rework (Correct answer)
- They are acceptable on inner layers only
Correct answer: They are rejectable defects requiring rework
IPC-A-610 Class 3 treats coating voids over exposed circuitry as rejectable conditions that require rework to ensure reliability.
Question 4: Which marking must appear on a product sold in the European Economic Area to declare conformity with applicable EU directives?
- UL mark
- CE mark (Correct answer)
- FCC ID
- RCM mark
Correct answer: CE mark
The CE mark (Conformité Européenne) is a mandatory conformity marking indicating a product meets EU health, safety, and environmental requirements.
Question 5: IPC-2152 provides guidelines for which critical PCB design parameter?
- Via hole aspect ratio
- Conductor current-carrying capacity (Correct answer)
- Solder mask registration
- Controlled impedance tolerance
Correct answer: Conductor current-carrying capacity
IPC-2152 is the standard for determining current-carrying capacity of printed board conductors (trace current ratings).
Question 6: When designing a medical PCB classified as IEC 60601-1 Class IIf, what does the 'f' suffix indicate?
- Flame-retardant substrate required
- Direct cardiac application with highest leakage current restrictions (Correct answer)
- Flexible PCB required
- Field-replaceable components only
Correct answer: Direct cardiac application with highest leakage current restrictions
The 'CF' (cardiac floating) type in IEC 60601-1 indicates the applied part can make direct cardiac contact, requiring the strictest leakage current limits.
Question 7: What is the significance of the IPC-7711/7721 standard for PCB compliance?
- It defines land pattern dimensions for SMT components
- It provides procedures for rework, repair, and modification of PCBs (Correct answer)
- It sets cleanliness testing requirements
- It specifies drill diameter tolerances
Correct answer: It provides procedures for rework, repair, and modification of PCBs
IPC-7711/7721 establishes procedures and requirements for reworking, repairing, and modifying electronic assemblies to maintain compliance.
PCB Regulatory Frameworks & Compliance 3
What is the primary purpose of the REACH regulation in the context of PCB design?