ABSTRACT
The special tests are not often required in the general type of installation, and require special test equipment. In consequence, the requirements for these tests are outlined as protection by barriers or enclosures and protection by non-conducting location. In on site, basic protection is provided by fabricating an enclosure or erecting a barrier, it must be shown that the enclosure can provide a degree of protection of at least IPXXB or IP2X, and IPXXD or IP4X. The test for IPXXB or IP2X is conducted with a standard test finger which is supplied at a test voltage not less than 40 V dc and not more than 50 V DC. The test for IPXXD or IP4X is conducted with a rigid 1 mm diameter wire with its end cut at right angles. Protection by non-conducting location is a rare location and demands specialist equipment to measure the insulation resistance between insulated floors and walls at various points.
