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電力電纜的選購技巧

來源:www.vanjashop.com         發布時間:2021-04-14 返回列表
電力電纜的選購技巧

當今有許多類型的電力電纜。購買電力電纜對于用戶來說也是一門科學。那么如何購買電力電纜?下面就讓我們來詳細了解一下購買技巧:


1.用火燃燒

劣質電纜在大火,明火和濃煙中燃燒時會迅速燃燒。高質量的電纜會緩慢燃燒,有少量煙霧或沒有煙霧,也沒有明火。


2.檢查包裝

電力電纜絕緣涂層上有標志,例如電纜規格等,且字跡清晰。通常,它不能被洗掉,更不用說將其擦掉了。電力電纜回路中有合格證明書。該證書具有制造商的地址質量體系認證,電壓等級,電線類型和規格等,但劣質電線上沒有或缺少任何物品。


3.看銅
銅的亮度越高,銅越好,并且亮度均勻,有光澤且沒有分層。合格的電纜銅芯應為紫紅色,有光澤且觸感柔軟。如果可以割掉一小塊塑料皮,請仔細檢查內部的銅線,然后用手掌輕輕觸摸銅線的頂部。它應該感覺光滑且無刺痛感,并且手感更柔軟。
劣質電力電纜的銅芯為紫黑色,淡黃色或白色,具有大量雜質,機械強度差和韌性差。 一點點的力就會將它們折斷,并且電纜中通常會斷開連接。 檢查時,您需要在一端將電線打開2厘米,然后在銅芯上擦一張白紙。如果上面有黑色物質,則意味著銅芯中有更多雜質。

此外,劣質電力電纜的絕緣層似乎很厚,但實際上,它們大多數是由回收塑料制成的。隨著時間的流逝,絕緣層將老化并漏電。


4.看絕緣
剪下一根電線,以查看其芯線是否在絕緣層的中間。不在中心的是低劣的工藝引起的偏心。如果功率較小,則仍可以安全使用。一旦功耗大,劣質電力電纜較薄的一側很可能會被電流擊穿。

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