The value of X in Figure 1 below is 200 ± 5mm. The effective strap length between A1 and the centre line of the Retractor Spool Re (when the webbing is fully extracted including the minimum length of 150mm for testing of Enhanced Child Restraint System) shall be 2,820 ± 5mm when measured in a straight line without load and on a horizontal surface. With the Enhanced Child Restraint System installed, there shall be a minimum of 150mm of strap length on the retractor spool