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http://tvnz.co.nz/national-news/solid-energy-closed-mine-not-another-pike-4733561

Solid Energy: Closed mine not another Pike

Published: 5:16AM Tuesday February 21, 2012 Source: ONE News State-owned Solid Energy says workers at its Spring Creek mine were never in danger despite the mine being closed because of safety concerns. The Department of Labour shut down the mine, about 10km outside of Greymouth, after three incidents in the last two weeks.
http://pikeriver.royalcommission.govt.nz/Commission-Hearings#transcripts

Commission Hearings - pikeriver.royalcommission.govt.nz

Phases There are four phases to the Pike River Royal Commission’s inquiries and the Commission will hold public hearings in relation to each of them:
Types of Neutral Earthing in Power Distribution: Introduction:

Types of Neutral Earthing in Power Distribution « Electrical Notes & Articals

http://electricalnotes.wordpress.com/2012/01/21/types-of-neutral-earthing-in-power-distribution/
In electrical engineering , ground or earth can refer to the reference point in an electrical circuit from which other voltages are measured, or a common return path for electric current , or a direct physical connection to the Earth .

Ground (electricity)

http://en.wikipedia.org/wiki/Ground_%28electricity%29
http://en.wikipedia.org/wiki/Power_line_communication Power line communication ( PLC ) carries data on a conductor that is also used simultaneously for AC electric power transmission or electric power distribution to consumers. It is also known as power line carrier , power line digital subscriber line ( PDSL ), mains communication , power line telecom ( PLT ), power line networking ( PLN ), and broadband over power lines ( BPL ). A wide range of power line communication technologies are needed for different applications, ranging from home automation to Internet access .

Power line communication