The open wire heating elements are usually made of nichrome wire. 裸線式電熱元件通常用鎳鉻合金絲製成。
Although the possibility is remote3, diode failure4 might eventually cause a small section of bare wire to contact the metal cabinet. 雖然這種可能性很小,但二極體故障可能最終導致一小部分裸線與金屬盒接觸。