Small aside — On use of shuttered receptacles {outlets} in the US, [formally called “tamper resistant”] the only one I know of is
http://www.hubbellcatalog.com/wiring/catalogpages/page_I04.pdf [page bottom] and
http://www.hubbellcatalog.com/wiring/section-i-datasheet.asp?FAM=HProducts&PN=HBL8200SG They are required In hospital pediatric locations by NEC Article 517. Maybe another reader can post more information about their use in the US. Hospitals and NEC517 are not my strong suit.
