Answer Posted / sunil ulange hit
INDOOR SUBSTATION MEANS THE SUBSTAIONS THAT WE KEPT INSIDE
THE ANY BULDINGS, HALLS
OUTDOOR SUBSTATION MEANS THE SUBSTATION THAT WE KEFT OUSIDE
PLACE MEANS BARRONS, DESERTS..ETC
AND THESE ARE DESIGNED CONSIDERING IP PREOTECTION.ie WATER
PROTECTION, DUST PROTECTION.. ie IP 54, IP55
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