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[問(wèn)題求助] UL 83型號(hào)求解！
P:2014-10-10 14:30:12
3
Thermoplastic-insulated wire is rated 600 V and is designated as follows:
TW — Indicates a single conductor having flame-retardant, moisture-resistant thermoplastic insulation. The wire is rated 60°C wet or dry.
THHN — Indicates a single conductor having flame-retardant and heat-resistant thermoplastic insulation with a jacket of extruded nylon or equivalent material. The wire is rated 90°C dry only.
THW — Indicates a single conductor having flame-retardant, moisture- and heat-resistant thermoplastic insulation. The wire is rated 75°C wet or dry.
THW-2 — Same as THW except that the wire is rated 90°C wet or dry.
THHW — Indicates a single conductor having flame-retardant, moisture- and heat-resistant thermoplastic insulation. The wire is rated 90°C dry and 75°C wet.
THWN — Indicates a single conductor having flame-retardant, moisture- and heat-resistant thermoplastic insulation with a jacket of extruded nylon or equivalent material. The wire is rated 75°C wet or dry. THWN wire suitable for exposure to mineral oil and to liquid gasoline and gasoline vapors at ordinary ambient temperature is marked "Gasoline and Oil Resistant I
" if suitable for exposure to mineral oil at 60°C, or "Gasoline and Oil Resistant II
" if the compound is suitable for exposure to mineral oil at 75°C. Gasoline resistant wire has been tested at 23°C when immersed in gasoline. It is considered inherently resistant to gasoline vapors within the limits of the temperature rating.
THWN-2 — Same as THWN except that the wire is rated 90°C wet or dry.
multiple wire-treatment unit - 多頭線材處理設(shè)備 （0） 投訴
P:2014-10-11 08:06:00
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但6樓沒(méi)有T90 Nylon和TWN75這兩個(gè)型號(hào)��？
skin effect - 集膚效應(yīng),趨膚效應(yīng)。在頻率增加時(shí)，通過(guò)導(dǎo)體之電流有聚集于表面的現(xiàn)象，頻率愈高此現(xiàn)象愈顯著，這是由于交流所產(chǎn)生之磁場(chǎng)使導(dǎo)體中芯與表面有電位差存在，并且中芯部位建立之電流阻止電流在中芯部位流通，而幫助導(dǎo)體表面電流之流通，結(jié)果使主電流大部份集中于導(dǎo)體外表，也就是降低了導(dǎo)體的有效面積，此種現(xiàn)象稱為集膚效應(yīng)。 （0） 投訴
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