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422.40 Polarity in Cord-And-Plug-Connected Appliances
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If the appliance is provided with a manually operated, line-connected, single-pole switch for appliance on-off operation, an Edison-base lampholder, or a 15- or 20-ampere receptacle, the attachment plug shall be of the polarized or grounding type.
A 2-wire, nonpolarized attachment plug shall be permitted to be used on a listed double-insulated shaver.
Informational Note: For polarity of Edison-base lampholders, see 410.82.
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