DC is not synonymous with low voltage - voltage drop is a red herring. Problems with DC that I can think of off the top of my head:
- Utility companies need to change out pole pigs for DC-DC converters.
- When electrocuted, muscles grab and lock up, rather than a mere painful buzzing.
- Lower mechanical switch ratings (no zero crossing for arcs to self-extinguish). Check out the printed DC ratings on a listed switch some time.
- Corrosion on exposed conductors due to constant potential difference.
- Low level magnetization of things next to power conductors.
- General disruption and uncertainty that change brings. I bet you could annotate most clauses in the NEC with the incident that prompted its addition.
- Nikola Tesla may wake up and finally use that death ray.
- Utility companies need to change out pole pigs for DC-DC converters.
- When electrocuted, muscles grab and lock up, rather than a mere painful buzzing.
- Lower mechanical switch ratings (no zero crossing for arcs to self-extinguish). Check out the printed DC ratings on a listed switch some time.
- Corrosion on exposed conductors due to constant potential difference.
- Low level magnetization of things next to power conductors.
- General disruption and uncertainty that change brings. I bet you could annotate most clauses in the NEC with the incident that prompted its addition.
- Nikola Tesla may wake up and finally use that death ray.