A scope of "NEC 2017 Article 706.1" is ESS over 50Vac(60Vdc).
On the other hand, NEC 2017 Article 490 is a general requirements for the system over 1000V.
So, I wonder if ESS is also covered by article 490.
For example) For PV system, Article 690.7 says to follow article 490 if the maximum votlage is over 1000V. On the other hand, I cannot find the similar expression in article 706.
+ Additional question;
- If the maximum system voltage is over 1000Vdc in ESS, are there additional requirements?
Thank you!!
"So, I wonder if ESS is also covered by article 490."
I suppose it could be.
"On the other hand, I cannot find the similar expression in article 706."
Probably nobody wrote it in yet.
"If the maximum system voltage is over 1000Vdc in ESS, are there additional requirements?"
Article 110 has a section on Over 1000-volts and Article 300 has a section on Over 1000-volts. Actually many other sections of code reference Over 1000-volts. Use the pdf search function in the 2017 NEC and enter "over 1000 volts" and see how many hits come up.