Unlike the UK, DC supplies for residential use were rare here. ESB was established and nationalised in 1927 and rapidly standardised on 220/380V 50Hz LV supply.
The only systems that would have been DC were independent town supplies, they were very quickly merged into ESB.
DC colours possibly never played much of a role in electrical contractors' day-to-day work here. Where as in the UK, they were around for much longer.
http://en.wikipedia.org/wiki/Electricity_Supply_Board#Standards Gives the details
