ESI 50-5 : ISSUE 1

Designed to secure compatibility, for light current applications, between plant contacts and equipment connected to these contacts. Applies only to voltage-free contacts, i.e. those which have no voltage on them in the absence of any external connections to them. Does not apply to contact circuits any part of which is situated in areas where intrinsic safety techniques have to be employed because of fire or explosion hazards, nor to switchgear tripping and control schemes. Circuits dealt with may be applied to functions as diverse as sequence control, protection, tripping, indication or recording. It is likely that on specific contracts it will be necessary to augment or modify the requirements of this Standard. It is necessary, that in any particular case where this Standard is quoted to refer to the Enquiry or Purchasing Spec