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National Electrical Switchboard Manufacturers Association
NESMASeminar 2010
National Electrical Switchboard Manufacturers Association
National Electrical Switchboard Manufacturers Association
National Electrical Switchboard Manufacturers Association
National Electrical Switchboard Manufacturers Association
National Electrical Switchboard Manufacturers Association
National Electrical Switchboard Manufacturers Association
National Electrical Switchboard Manufacturers Association
National Electrical Switchboard Manufacturers Association
NESMASeminar 2010
National Electrical Switchboard Manufacturers Association
NSW Serviceand
Installation Rules
By Mark BetcherBlacktown City Switchboards
National Electrical Switchboard Manufacturers Association
SIR Committee consists of
representatives from:
- NESMA
- Energy Australia
- Integral Energy
- Country Energy
- NECA
- Office of Fair Trading
- Accredited Service Provider
Convenor Robert Smith, Dept. of
Industry and Investment.
Available to download at –
http://www.industry.nsw.gov.au/
energy/electricity/network-
connections/rules
National Electrical Switchboard Manufacturers Association
Section 4 – Service and Metering Equipment
Clause 4.7 Service Protective Device
-Must be located adjacent to or incorporated in the main
switchboard.
-Located no higher than 2.0m to the top of the device and no lower
than 0.5m to the line side terminals of the device above the ground or
platform.
Top Entry
Incoming Consumers Mains
C/T’s
SPD
2000
Bottom Entry
Incoming Consumers Mains
C/T’s
SPD
500
National Electrical Switchboard Manufacturers Association
Section 4 – Service and Metering Equipment
Clause 4.7 Service Protective Device
-If the Service Protective Device is greater than 100amps it must be
designed and installed in accordance with the requirements of
AS/NZS3439.1 Annex ZC arc minimization.
Annex ZC extract:
Typical means of reducing the
probability of initiation of internal
arcing or minimizing its magnitude
or duration, or both, and limiting
its effects are by the provision of
one or more insulation systems
completely surrounding live
conductors.
National Electrical Switchboard Manufacturers Association
Section 4 – Service and Metering Equipment
Clause 4.7 Service Protective Device – Circuit Breakers.
-Grade (discriminate) with the electricity distributor’s protection
-Have the facility for locking and sealing in the ‘off’ position.
-Have adjustable settings sealable such that only authorised persons
have access. Where such settings are located behind a sealed
escutcheon this provision does not apply. (proposed 2010 change)
-Have the line side labelled.
Service Protective Device with
padlocking facility
National Electrical Switchboard Manufacturers Association
Section 4 – Service and Metering Equipment
Clause 4.7.2 100A Service Protective Devices and Service Fuses
(proposed 2010 change)
This change to the 2010 edition confirms
that service fuses for direct connect
meters are to comply with the height
requirements for Service Protection
Devices.
Located no higher than 2.0m to the top
of the device and no lower than 0.5m to
the line side terminals of the device
above the ground or platform.
National Electrical Switchboard Manufacturers Association
Section 4 – Service and Metering Equipment
Clause 4.13.2 Current Transformer Metering
A sealable isolation device must be provided for CT metered
installations. This isolation device is located on the line side of the
CT’s, which allows each individual tariff or customer to be isolated
and sealed.
w
M
Incoming supply
SPD
Isolator
M
w
Isolator
Tenant 1 Tenant 2
wIsolator
M
House
National Electrical Switchboard Manufacturers Association
Section 4 – Service and Metering Equipment
Clause 4.17 Current Transformer Metering
-Must be mounted in a segregated section of the switchboard
-All live conductors within 300mm of the secondary terminals, voltage
circuit fuses and metering neutral link must be insulated or screened.
-Where a screen is used it must be fitted with two insulated handles
and be secured to the switchboard. (proposed 2010 change, this
clarifies that if the busbar system is fully insulated a screen is not
required)
National Electrical Switchboard Manufacturers Association
bare busbar with shield
Fully insulated system
shield now not required in
can be removed
National Electrical Switchboard Manufacturers Association
Section 4 – Service and Metering Equipment
Clause 4.17 Current Transformer Metering
-Access door must be capable of opening to 90deg minimum
-Access covers must not be greater than 1sqm in area and the length
must not exceed 1500mm.
-C/T’s, removable bars, voltage circuit fuses and neutral links must be
more then 500mm and less than 2500mm from the ground or
platform.
-There must be a distance of 100mm min and 300mm max from the
C/T terminals to the back of the enclosure door.
-The length of the removable link must be 300mm min and 450mm
max.
National Electrical Switchboard Manufacturers Association
Bottom Entry
Incoming Consumers Mains
C/T’s
SPD
2500
top of
removable link
Top Entry
Incoming Consumers Mains
C/T’s
SPD
500
bottom of
removable link
National Electrical Switchboard Manufacturers Association
Access cover less than
1sqm and must open at
least 90deg
Between 100 and 300mm
from the terminals to the
back of the door
Link 300mm min
and 450mm max
National Electrical Switchboard Manufacturers Association
Section 4 – Service and Metering Equipment
Clause 4.2.3Multiple Occupancy Premises
-Metering to be grouped at one metering position
-In a location accessible to all associated tenants
Exceptions
-Multi-storey developments – group the meters together on each floor
-Factory unit developments, shopping centres and malls – locate
external to the tenancies
-Remotely read meters – may be located within the tenancy at
customers expense, refer to electricity distributor
National Electrical Switchboard Manufacturers Association
Section 4 – Service and Metering Equipment
Clause 4.21 Labelling
-Warning labels, lifts and fire services to be red background with white
letters.
-Main Switch labels to have a different background colour to the
background colour used for other labels, unless they are red as
required above.
Where cascade or series connected
circuit breaker are installed for
current limiting purposes a warning
label must be installed adjacent to the
circuit breakers.
National Electrical Switchboard Manufacturers Association
National Electrical Switchboard Manufacturers Association
Section 4 – Service and Metering Equipment
Clause 4.21 Labelling
Main Switchboards must be labelled with the following information
-The fault rating for 1 second.
-The manufacturers name or trademark.
-IP rating.
-Type, designation or identification number or other means of
identification so that anyone can get relevant information about it
from the manufacturer.
National Electrical Switchboard Manufacturers Association
NESMASeminar 2010