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Connectors for 200V dc

davidwalker2
I have an installation that uses 200V dc (balanced about earth but not earthed). All the installed equipment is direct wired, but I have an application that needs a plug and socket.  I don't want to use the standard connectors that are also used for ac to avoid ac equipment being plugged in inadvertently.  The equipment in question will draw a current around 8 amps and is metal framed, not double insulated so needs an earth.  I would be grateful for any suggestions/ advice.


I am sure that this has been discussed previously, but I cannot find it on the old forum.


Many thanks,


David
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    Again, many thanks for your replies.  The Guide recommended by Graham is very useful and addresses many things we have needed to resolve over the years.  Unfortunately it rather cops out on the connector issue, stating that “the standards required by this legislation [Plugs and Sockets (Safety) Regulations] restrict the use of general-purpose socket-outlet circuits for currents of 13 A or less operating at LV d.c. in relevant parts of electrical installations.”

    For information, on our site the main dc source is a 200A mercury arc rectifier (see my avatar) backed by a lower power solid state supply (40A).  Fuses are BS88 dc types, disconnectors are heritage (1928) open frame, and a couple of modern dc contactors.  Our major problem has been wire colours, red/black on the oldest heritage cabling, brown/blue on later heritage modifications.  We have chosen not to introduce a third combination, the current standard brown/grey and rely on separation, clear labelling and a competent expert workforce.


    David

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  • 0
    Again, many thanks for your replies.  The Guide recommended by Graham is very useful and addresses many things we have needed to resolve over the years.  Unfortunately it rather cops out on the connector issue, stating that “the standards required by this legislation [Plugs and Sockets (Safety) Regulations] restrict the use of general-purpose socket-outlet circuits for currents of 13 A or less operating at LV d.c. in relevant parts of electrical installations.”

    For information, on our site the main dc source is a 200A mercury arc rectifier (see my avatar) backed by a lower power solid state supply (40A).  Fuses are BS88 dc types, disconnectors are heritage (1928) open frame, and a couple of modern dc contactors.  Our major problem has been wire colours, red/black on the oldest heritage cabling, brown/blue on later heritage modifications.  We have chosen not to introduce a third combination, the current standard brown/grey and rely on separation, clear labelling and a competent expert workforce.


    David

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