鋁假天花板要水線?

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發表於 2016-12-31 15:16 | 只看該作者

支燈寫住唔係膠　航空鋁材
別問我是誰發表於 2016-12-30 22:22

哩隻燈攞過上手，燈身係合金再噴油，燈身會暖因用作散熱，而牛殼係膠。哩Ｄ牛很多都印有雙絕緣。我隨手攞隻12W LED燈連牛，只需HK$1X，佢隻牛都印有雙絕緣。現附上拆骨牛，敬希Ching指點下是否真雙絕緣。

我都係鋁假天花，裝修CF冇裝水線，接線只用簪玉就咁放係鋁假天花上。為求安心，自已加番哂過路箱，所有電線加番哂軟導管。睇嚟要加埋水線會安全D。

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diputs

中級會員

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發表於 2016-12-31 15:34 | 只看該作者

本帖最後由 diputs 於 2016-12-31 15:42 編輯

有關雙重絕緣電器裝置 http://double-insulated.com/
Double insulated or class II electrical appliances are products that have been designed in a way so as not to require a safety connection to electrical earth (These products must NOT have a safety connection to Earth).

These products are required to prevent any failure from resulting in dangerous voltage levels becoming exposed causing a shock etc. This must be done without the aid of an earthed metal casing. Ways of achieving this include double layers of insulating material or reinforced insulation protecting any live parts of the fitting.

There are also strict requirements relating to the maximum insulation resistance and leakage to any functional earth or signal connections of such appliances. Products of this type are required to be labelled "Class II", "double insulated" or bear the double insulation symbol (the symbol displayed above) Follow some of the links below to view / purchase some examples of these products.

除以塑膠外殼做第二重絕緣的雙重絕緣裝置外(亦要同時滿足雙重絕緣對最大絕緣電阻及對地漏電流要求)，仲有如下文最後一種有金屬外殼(作機械保護或散熱等用途，但亦需滿足絕緣電阻及對地漏電流要求)的雙重絕緣電器裝置(Metal-encased Class II products)
http://www.excelsys.com/wp-conte ... ClassIvsClassII.pdf

Class II (Double Insulated) electrical products may be any of the following types:

• Double-insulated electrical products which comprise both basic insulation and supplementary insulation. In other words, there are two layers of insulation between the live parts and accessible parts of this type of product. In the case of products with outer casing made from insulating material, the casing will be ranked as one of the required layers of insulation.

• Reinforced-insulated electrical products which comprise single layer of insulation system to the live parts and provide a degree of protection against electric shock equivalent to double insulation.

• Electrical products which have durable and substantially continuous enclosure made of insulating material. All metal parts, except small parts such as nameplates, screws and rivets which are separated from the live parts are enclosed by insulation at least equivalent to reinforced insulation. This type of electrical products is called insulation encased Class II products.

• Electrical products which have substantially continuous metal enclosure in which double insulation is used throughout, except for those reinforced insulated parts where the application of double insulation is obviously impracticable. Such electrical products are called metal-encased Class II products.

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