a) A straight edge placed in any position, across and in contact with edges of the plug opening without the plug in place, cannot be made to contact any current-carrying pin.
b) With the plug aligned with the pins and the face of the plug in a plane located perpendicular to the end or ends of the farthest projecting current–carrying pin, the probe illustrated in Figure 7.2 should not touch any current-carrying pin while the probe is inserted through any opening with the appliance in any position.