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取得防爆合格證的空外殼內部安裝無防爆認證（防爆合格證）的儀表。

取得防爆合格證的空外殼內部安裝取得防爆認證（防爆合格證）的儀表。

以上兩種情況，都需要取得整體防爆合格證，才可以使用在爆炸性環境。

以隔爆外殼"d"為例進行說明：

GB/T 3836.15-2017 爆炸性環境第15部分：電氣裝置的設計、選型和安裝（IEC 60079-14：2007，MOD）

10 對隔爆外殼"d"的補充要求

10.1 總則

僅有Ex元件防爆合格證（帶有符號"U"）的隔爆外殼不得安裝，它們應與設備組裝在一起取得設備防爆合格證。

設備不經重新評定不能改變設備的內部元件,因為忽視條件變化會導致壓力重疊、溫度組別變化或其他類似的可能使防爆合格證失效的情況。

IEC 60079-14：2007 Explosive atmospheres - Part 14: Electrical installations design, selection and erection

IEC 60079-14：2013 Explosive atmospheres - Part 14: Electrical installations design, selection and erection

14 Additional requirements for type of protection "d" – Flameproof enclosures

14.1 General

Only Ex "d" equipment having a complete certificate shall be installed.

Ex "d" enclosures and components having only a component certificate, i.e. marked with a "U", shall not be installed in the hazardous area unless as part of an assembly of components (now being referred to as equipment), when the components in the equipment are permitted by a full Ex certificate which may contain an "X" and the equipment label carries full Ex marking including temperature class.

Additional holes or modification to entries shall only be made into an Ex "d" enclosure by the manufacturer or an appropriately qualified certified service facility.

Alteration of the internal components of the equipment is not permitted without re-evaluation of the equipment because conditions may be created inadvertently which lead to pressure- piling, change in temperature class, or other such issues that may invalidate the certificate.

譯文：

14 對隔爆外殼"d"的附加要求

14.1 通則

僅應安裝具有完整證書的Ex"d"設備。

僅有元件證書（即帶有符號"U"）的Ex"d"外殼和元件，不應安裝在危險場所內，除非它們是元件組件（現在稱為設備）的一部分，且設備中的元件被帶"X"的完整防爆合格證所允許，設備銘牌有包括溫度組別在內的完整防爆標志。

對Ex"d"外殼增加或改動引入孔僅應由制造商或經認證的有資質修理單位進行。

設備不經重新評定不準許改變設備的內部元件，因為忽視條件變化會導致壓力重疊、溫度組別變化或其他類似的可能使防爆合格證失效的情況。