5.2.13 The ends of flexible stranded conductors may be tinned, but shall not have additional
solder applied, unless a means is provided of ensuring that clamped connections cannot work
loose owing to cold flow of the solder (see Figure 28).
NOTE This requirement is met when spring terminals are used. Securing the clamping screws is not an adequate
means of preventing the connection of soldered strands from working loose owing to cold flow of the solder.