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Posted By Topic: AS/NZS 3012:2018 Draft Released

SteveH
May 11 2018 23:33

Got a bitch about anything in AS/NZS 3012:2010? Then have your say on the next version, AS/NZS 3012:2018 has is available at Standards NZ for comment, note NZ only changes to Appendix L – CONSTRUCTION POWER SUPPLY ARRANGEMENTS FOR DOMESTIC HOUSING SITES
https://shop.standards.govt.nz/docserv/drafts/DZ_3012_NZ_Appendix_L_Public_Comment_DraftV2.pdf
   

SteveH
May 12 2018 08:02

L.3 Connection requirements
The construction power supply switchboard shall be provided within the site boundary and in accordance
with 2.3, and additionally, shall provide all of the following:
"NOTE The requirement of the switchboard within the site boundary is to prevent extension cords to the building site from
crossing road reserve.
(a) The system of supply shall be TN-C-S (MEN) single phase;
(b) The provision of a 16 A socket outlet complying with IEC 60309 for the connection and supply of a
transportable structure (connectable installation in NZ) is optional"

The first change, provision of a 16A socket outlet "shall be provided"

There should be nothing optional about provision of suitable supplies to run concrete polishers, welders, dust extraction systems on any site
   

pluto
May 12 2018 10:07

SteveH May 12 2018 08:02

Your comment (part only)


The first change, provision of a 16A socket outlet "shall be provided"

There should be nothing optional about provision of suitable supplies to run concrete polishers, welders, dust extraction systems on any site

My comment

Did you read all of the proposed index?

All socket outlets for general use are required to 15 A (3 pin flat pin) this should be able to supply this high currnt devices.

Also this appendix only covers DOMESTIC housing, it is not for commerical building sites.
   

Sarmajor
May 12 2018 12:31

The other reason for requiring the Builder Temp to be inside the boundary is to reduce the risk of the electrician driving the earth electrode through the 11kV cable and tripping out the earthing protection of a large part of Morrinsville or any other place.

Lucky he missed the LV cable which could have dumped even more fault current into the situation.

It took about 4 hours to locate and isolate the fault to restore power to the surrounding areas and even longer to repair that cable and restore power top the subdivision supplied by that particular circuit.

   

pluto
May 12 2018 15:28

Sarmajor May 12 2018 12:31
Your comments

The other reason for requiring the Builder Temp to be inside the boundary is to reduce the risk of the electrician driving the earth electrode through the 11kV cable and tripping out the earthing protection of a large part of Morrinsville or any other place.

Lucky he missed the LV cable which could have dumped even more fault current into the situation.

It took about 4 hours to locate and isolate the fault to restore power to the surrounding areas and even longer to repair that cable and restore power top the subdivision supplied by that particular circuit.

My comment

When the appendix was drafted the protection of LV or HV cables in the street was not considered, but it is a good one point. there have many "near misses" over the years with earth rods being driven into the ground.

The main reason was for health and safety on work sites reasons to try and keep live extension cords off the street.
   

SteveH
May 12 2018 17:34

"All socket outlets for general use are required to 15 A (3 pin flat pin) this should be able to supply this high current devices"

Not what the wording says, one or both are to be 15A is mentioned in notes to Diagram L1, on wiring diagram, one outlet is labelled 10A and the other 15A

"Also this appendix only covers DOMESTIC housing, it is not for commerical building sites"

Give that Worksafe will be pushing dust extraction/containment on all sites, sorting out a real supply for any site is better done from the get go- rarely seems to be an adequate supply for the domestic out of the ground builds I've been on