（如IEC 60664-1中所定義），海拔高達(dá)2000米（6562英尺），無需降額。
本設(shè)備不適用于居住環(huán)境，可能無法為無線電提供足夠的保護(hù)
此類環(huán)境中的通信服務(wù)。
該設(shè)備作為開放式設(shè)備提供。它必須安裝在適當(dāng)設(shè)計(jì)的外殼內(nèi)
將存在的特定環(huán)境條件，并適當(dāng)設(shè)計(jì)，以防止
帶電部件的可訪問性。外殼必須具有適當(dāng)?shù)淖枞夹阅埽苑乐够虮M量減少火焰蔓延，
符合5VA的火焰蔓延額定值，如果是非金屬材料，則應(yīng)獲得批準(zhǔn)。外殼內(nèi)部必須
只能使用工具訪問。本出版物的后續(xù)章節(jié)可能包含有關(guān)特定
符合某些產(chǎn)品安全認(rèn)證要求的外殼類型額定值。
除本出版物外，請(qǐng)參見以下內(nèi)容：
•工業(yè)自動(dòng)化布線和接地指南，羅克韋爾自動(dòng)化出版物1770-4.1，用于附加安裝
要求
•NEMA標(biāo)準(zhǔn)250和IEC 60529（如適用），用于解釋外殼提供的防護(hù)等級(jí)
1756-TBCHThis equipment is intended for use in a Pollution Degree 2 industrial environment, in overvoltage Category II applications (as defined in IEC 60664-1), at altitudes up to 2000 m (6562 ft) without derating. This equipment is not intended for use in residential environments and may not provide adequate protection to radio communication services in such environments. This equipment is supplied as open-type equipment. It must be mounted within an enclosure that is suitably designed for those specific environmental conditions that will be present and appropriately designed to prevent personal injury resulting from accessibility to live parts. The enclosure must have suitable flame-retardant properties to prevent or minimize the spread of flame, complying with a flame spread rating of 5VA or be approved for the application if nonmetallic. The interior of the enclosure must be accessible only by the use of a tool. Subsequent sections of this publication may contain additional information regarding specific enclosure type ratings that are required to comply with certain product safety certifications. In addition to this publication, see the following: • Industrial Automation Wiring and Grounding Guidelines, Rockwell Automation publication 1770-4.1, for additional installation requirements • NEMA Standard 250 and IEC 60529, as applicable, for explanations of the degrees of protection provided by enclosure
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