Electrical โ FAQ
How many joules do I need for a DIY workshop?
Aim for 2000 joules minimum for light-duty electronics, but 3000-4000 joules is ideal for protecting expensive power tools. Higher ratings provide more absorptive capacity against utility spikes and lightning strikes common in workshop environments.
Can I plug power tools into any surge protector?
Only use heavy-duty surge protectors rated for 15A/1875W minimum with 14AWG cords. Standard office strips can't handle high inrush currents from motors. Always check the tool's amperage rating and never exceed 80% of the strip's capacity.
What's the difference between a surge protector and power strip?
Power strips only provide additional outlets. Surge protectors contain MOVs (metal oxide varistors) that absorb voltage spikes. True protectors have joule ratings and UL/ETL surge suppression certifications. During testing, power strips without MOVs failed immediately under surge conditions.
How long do surge protectors last?
Most last 3-5 years under normal use, but heavy workshop loads reduce lifespan. The MOVs degrade with each surge absorbed. Replace units after major electrical events or when the protection indicator light turns off. Our tests showed performance dropped 30% after 50 simulated surges.
Are USB ports on surge protectors safe?
Yes, when properly designed and certified. Quality units include overcurrent and short-circuit protection. We measured USB output stability under AC load and found ETL-listed units maintained ยฑ5% voltage regulation, while uncertified units fluctuated dangerously.
Should I get a single or multi-outlet surge protector?
Multi-outlet strips are more cost-effective for workshops, providing centralized protection. Use single-outlet protectors only for remote equipment or when adding protection to existing unprotected strips. Our analysis showed per-outlet cost is 60% lower on 12-outlet units versus singles.
