NZQA registered unit standard
20415 version 4
Page 1 of 5
Title
Carry out condition assessments of electricity supply steel structures
Level
4
Credits
5
Purpose
People credited with this unit standard are able to: demonstrate
knowledge of steel tower structures and the impact defects
may have upon them; plan and prepare for the condition
assessment of steel tower structures; carry out condition
assessment of steel tower structures; and report steel tower
condition assessment results.
Classification
Electricity Supply > Electricity Supply - Transmission Networks
Available grade
Achieved
Explanatory notes
1
This unit standard is intended for, but not restricted to, workplace assessment. The
range statements across the unit standard can be applied according to industry
specific equipment, procedures, and processes.
2
Safety of personnel and plant must be a priority throughout the assessment. If the
safety requirements are not met the assessment must stop.
3
Performance and work practices in relation to the outcomes and evidence
requirements, must comply with all current legislation, especially the Electricity Act
1992 and any subsequent amendments, and any regulations, codes of practice
recognised under that statute; Health and Safety in Employment Act 1992, the
Resource Management Act 1991, and their subsequent amendments; electricity
supply industry codes of practice and documented enterprise procedures. These
include updated versions of Safety Manual – Electricity Industry (SM-EI) Wellington:
Electricity Engineers’ Association.
A full list of current legislation and industry codes is available from:
Infrastructure Industry Training Organisation
PO Box 2759
Wellington 6140
4
The phrase in accordance with industry requirements is implicit in all outcomes and
evidence requirements in this unit standard.
5
Industry requirements include all asset owner requirements; manufacturers’
specifications; and enterprise requirements which cover the documented workplace
policies, procedures, specifications, and business and quality management
requirements relevant to the workplace in which assessment is carried out.
Infrastructure ITO
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
20415 version 4
Page 2 of 5
Outcomes and evidence requirements
Outcome 1
Demonstrate knowledge of steel tower structures and the impact defects may have upon
them.
Evidence requirements
1.1
Steel structure types are described.
1.2
Steel structure foundation types are described.
Range
includes but is not limited to – grillage foundations, concrete
anchor bolt foundations, concrete stub leg foundations, baseplate
foundations.
1.3
Standard tower leg identification system is described.
1.4
Structure sections are described in terms of foundation, body, body extension,
cross arm, leg extension, super structure, and earth peak.
1.5
The impact of steel structure defects on the mechanical structure is described.
Range
1.6
The impact of tower foundation defects on the mechanical structure is
described.
Range
1.7
includes but is not limited to – embedment depth, soil compaction,
foundation types including concrete, strengthened soil, grillage, tie
beams, compacted soil.
Impact of adjacent excavations and inadequate compaction is explained.
Range
1.9
includes but is not limited to – corrosion damage, loss of
cross-section area, kinked steel members, bent steel members,
embedment, vandalism, lateral support.
Tower foundation requirements are explained.
Range
1.8
includes but is not limited to – corrosion damage, loss of
cross-section area, kinked steel members, bent steel members.
includes but is not limited to – embedment depth, soil compaction,
foundation types including concrete, strengthened soil, grillage, tie
beams, compacted soil.
Earthing types and deterioration are identified and described.
Range
Infrastructure ITO
SSB Code 101813
includes but is not limited to – earth wire bonds, earth wire
jumpers, external earthing, theft.
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
20415 version 4
Page 3 of 5
Outcome 2
Plan and prepare for the condition assessment of steel structures.
Evidence requirements
2.1
Scope of work is identified.
Range
includes but is not limited to – inspection requirements, site
information, plans, procedures, approvals.
2.2
Landowners are notified and access is agreed.
2.3
Measuring equipment is selected.
2.4
Check sheets for inspections are selected.
2.5
Specialist staff requirements are identified in terms of MAD’s and excavation.
2.6
Structure design drawings and codes are identified and described.
Outcome 3
Carry out condition assessment of steel structures.
Evidence requirements
3.1
Structure distortion, racking, and leaning is identified and quantified.
3.2
Structure is inspected and defects identified according to industry requirements.
Range
3.3
Structure fittings are inspected and defects identified.
Range
3.4
includes but is not limited to – corrosion, missing bolts, bolt sizes,
flat and spring washers, single and double nut fixings, bolt torque.
Tower protective coatings are inspected and defects identified.
Range
3.5
includes but is not limited to – corrosion, deformation, splits,
missing members, vandalism.
includes but is not limited to – common paint systems, potential
lead-based paint coatings, paint deterioration.
Tower accessories are inspected and defects identified.
Range
Infrastructure ITO
SSB Code 101813
includes but is not limited to – climb deterrents, line structure
danger signage, circuit phase identification signage, aerial
identification signage, aerial communication cable signage.
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
3.6
20415 version 4
Page 4 of 5
Tower foundations are inspected and defects identified.
includes but is not limited to – under embedment, erosion,
adjacent excavations.
Range
3.7
Worksite Safety Plan is carried out.
3.8
Ground condition categories are determined.
includes but is not limited to – soil types (cohesive, non-cohesive,
mixed); water tables (fluctuating, dry, swampy, estuarine); terrain
type (mountainous, hilly, flat, urban); wind factors, structure
location category.
Range
Outcome 4
Report steel structure condition assessment results.
Evidence requirements
4.1
Steel structure condition coding system is applied.
4.2
Size, location and impact of all defects are recorded.
includes but is not limited to – corrosion, deformation, splits,
missing members.
Range
4.3
Defective steel structures are reported.
Planned review date
31 December 2020
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
20 April 2004
31 December 2018
Rollover and
Revision
2
21 November 2008
31 December 2018
Review
3
19 November 2010
31 December 2018
Review
4
20 August 2015
N/A
Consent and Moderation Requirements (CMR) reference
0120
This CMR can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Infrastructure ITO
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
20415 version 4
Page 5 of 5
Please note
Providers must be granted consent to assess against standards (accredited) by NZQA,
before they can report credits from assessment against unit standards or deliver courses
of study leading to that assessment.
Industry Training Organisations must be granted consent to assess against standards by
NZQA before they can register credits from assessment against unit standards.
Providers and Industry Training Organisations, which have been granted consent and
which are assessing against unit standards must engage with the moderation system that
applies to those standards.
Requirements for consent to assess and an outline of the moderation system that applies
to this standard are outlined in the Consent and Moderation Requirements (CMR). The
CMR also includes useful information about special requirements for organisations wishing
to develop education and training programmes, such as minimum qualifications for tutors
and assessors, and special resource requirements.
Comments on this unit standard
Please contact the Infrastructure ITO (Connexis) qualifications@connexis.org.nz if you
wish to suggest changes to the content of this unit standard.
Infrastructure ITO
SSB Code 101813
 New Zealand Qualifications Authority 2016