Hello. The standard is BS5733:2010 +A1:2014. If you contact our technical team, details of which will be shown on the instruction leaflet provided with this product or via our web site www.electrium.co.uk, our team will be able to provide you with a D of C. Thank you for your interest in our Appleby brand.
Answered by: Appleby Expert
Date published: 2019-11-01