Box door and box body all weld bolt to counteract many soft line conjunction and have to goodly connect ground a protection.The protection grade of the product outer shell is an IP53 and match GB7251.1 and IEC60493-1 etc.standard. Box door and box body all weld bolt to counteract many soft line conjunction and have to goodly connect ground a protection.The protection grade of the product outer shell is an IP53 and match GB7251.1 and IEC60493-1 etc.standard.