Equipment has a way of cutting its circuits off electrically from the supply mains, breaking every pole at the same moment (polyphase equipment that is permanently installed may leave the neutral connected where local conditions hold its voltage within limits), lockable in the off position for permanently installed equipment where reconnection would be hazardous or the isolation cannot be seen from the operator's or service person's position, with the isolation requirements stated in the accompanying documents; the means is incorporated or, if external, described in the technical description; a mains switch used for isolation meets the IEC 61058-1 distances for a 4 kV transient, is never in the cord or an external flexible lead, and its actuator moves per IEC 60447; in non-permanently installed equipment without a mains switch an appliance coupler or plug is the isolation means; a fuse or semiconductor is never an isolating means; no device disconnects the equipment by creating a short circuit that trips an over-current device; and parts inside the enclosure at more than 60 V for d.c., or for a.c. 42.4 V peak, which no always-accessible external switch or plug can disconnect are covered against touch after opening or clearly marked as exceeding the permitted voltage (the general-warning symbol alone not sufficing), checked with the test finger. Integral multiple socket-outlets meet 16.2 and 16.9.2.1. A mains plug carries no more than one power supply cord; cords are at least as robust as ordinary tough rubber-sheathed or PVC-sheathed flexible cord, PVC cords not being used where touchable external metal exceeds 75 degrees unless rated for it; conductor cross-sections meet Table 17 by rated current; IEC 60320-1 appliance couplers are deemed to comply; a cord anchorage relieves the conductors of strain including twisting and protects the insulation from abrasion at entry, is of insulating material or insulated or lined metal where cord insulation failure could raise unearthed accessible parts above the limits, does not clamp the cord with a screw bearing on the insulation, uses screws that fix nothing else, keeps the earth conductor free of strain if the anchorage fails while phase conductors are still connected, and prevents the cord being pushed in, tested by 25 pulls and a torque per Table 18 with no more than 2 mm sheath displacement or 1 mm conductor movement and no reduction of distances, and by pushing the cord in; cords of equipment that is not stationary have either a shaped opening or a cord guard made of insulating material, tested at 45 degrees with a mass of ten times the cord diameter in grams and a radius of curvature never under 1.5 times the diameter. Permanently installed equipment and equipment with service-replaceable non-detachable cords have mains terminal devices ensuring reliable connection, with barriers so that a broken-away conductor cannot reduce distances below 8.9, clamping screws that fix nothing else, terminals closely grouped with the protective earth terminal for rewirable cords, inaccessible without a tool, located or shielded so that an escaped strand is unlikely to short a means of protection (tested with one free 8 mm strand bent in every direction), fixed so that tightening does not stress internal wiring or reduce distances (ten fastenings of the largest conductor), requiring no special conductor preparation, not damaging or releasing conductors, and with enough space to introduce, connect and inspect conductors before fitting the cover. A fuse or over-current release is in each supply lead of class I equipment and of class II equipment with a functional earth, and in at least one lead of other single-phase class II equipment, the neutral of permanently installed equipment never fused, omission allowed only where two means of protection exist between all opposite-polarity parts of the mains part and between the mains part and earth up to and within every component with short-circuit faults in other circuits verified, with the reasoning recorded in the risk management file; the protective earth conductor is never fused; protective devices have breaking capacity for the maximum fault current. Internal mains wiring between the terminal device or inlet and the protective devices has at least the cord's cross-section, and other mains part wiring and printed tracks are sized to prevent fire under fault current, tested where necessary by simulating a single insulation fault at the least favourable point on a supply giving the worst short-circuit current with no hazardous situation of 13.1.2.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.