two supplies to a relay

[Spoon]

As has mentioned above. Label the panel accordingly and make sure the wires of the external source are orange.

 

[Darkwood]

What exactly do the remote supply cables do... you fall within the BS EN 60204-1 not the BS7671 and this only really allows certain set-ups referring to 5.3.5 of the 60204-1 for accepted circuits and the measures needed to take when applied.

 

[markythesparky]

The remote cables (running from the relay contacts) are feeding other mains contactors for pumps and heating devices.

 

[gnuuser]

i think the ops title should have been a little clearer
seemed to be a little confusion there
if a relay is supplying /sourcing power to two separate contactors then proper lableing and documentation is required as well as assuring the relay can handle the additional load.
as well as having a lockable disconnect between the relay and each of the contactors it supplies

if a single relay has 2 separate control supplies such as including a remote or jog start button.
then an interlock device needs to be installed to prevent both from being able to function at the same time

these are US rules I know but i am here to learn and exchange ideas