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NFPA 70 电气规范
日期:2012-02-08 16:41
ommunications systems with requirements for wireless, routers, and wireless disconnects.
New requirements focused on workplace safety include
Means to reduce incident energy (240.87)
Labeling at subpanels to identify feeder supply source (408.4(B))
Disconnecting means for transformers (450.14)
Get first-time provisions on electrical installations over 600 volts.
New Article 399 incorporates requirements for overhead distribution systems for large electrical system users, such as school or bu

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