أنشئ حسابًا أو سجّل الدخول للانضمام إلى مجتمعك المهني.
This is due to the fact that the sky-lighting is negatively charged and because the negative-negative polarity repels each other. Hence, in this way you minimize the chances on the ground to get hit by sky-lightng
It is to prevent corrosion. When -48 is supplied to equipment the cabinet will be +v ground and this will make the cabinet more positive that ground. This will prevent the cabinet from corrosion and hence longer equipment life. Something called "cathode protection is the concept.
هل تحتاج لمساعدة في كتابة سيرة ذاتية تحتوي على الكلمات الدلالية التي يبحث عنها أصحاب العمل؟