Introduction
Even the best SPD won’t work if installed incorrectly. Let’s explore the most common installation errors and how to fix them.
1. Installing the Wrong Type of SPD
Use Type 1 for service entrances, Type 2 for distribution panels, and Type 3 at outlets. Mixing these up reduces protection.
2. Poor Grounding
SPDs need a low-impedance ground path. A loose or corroded connection can render the SPD ineffective.
3. Excessively Long Leads
Long wires increase impedance, delaying the SPD’s response. Keep leads short and direct.
4. Lack of Coordination Between SPD Types
Using only Type 3 without upstream Type 1 or 2 leaves your system vulnerable.
5. No Monitoring or Replacement After Surges
Many SPDs degrade with each surge. Use models with status indicators and schedule replacements.
6. Installing Only at the Main Panel
Layered protection ensures downstream safety. Use additional SPDs at subpanels and outlets.
7. Ignoring Electrical Code Requirements
Follow local and international standards like NEC Article 285 or IEC 61643.
Conclusion
Avoiding these mistakes ensures your SPD performs reliably when needed. When in doubt, consult professionals.
