CATEGORIES OF PROTECTION AGAINST ELECTRIC SHOCK. PC1: No integral protection against electric shock. If required, designers must provide additional protection against electric shock on equipment. PC2: With integral protection against electric shock. Fuse holders shall have inaccessible live parts according to IEC529 standard contact test, when assembled, without the fuse holder or fuse in place and when the fuse holder is in place, when the fuse is inserted or removed. PC3: With integral protection against electric shock. Fuse holders shall have the live parts inaccessible with the 1 mm rigid test lead according to IEC529, when assembled, without the fuse holder or fuse in place and with the fuse holder in place, when the fuse is inserted or removed.