3. Connecting to the Gas Network
3.4 Accessibility
Accessibility to gas meter boxes must be provided and maintained for the provision of:
• Gas service pipe installation
• Emergency shut-off
• Maintenance
• Gas meter reading
• Inspection
A minimum 600mm clearance must be maintained in front of the gas meter box at all times.
3.5 Service Connection
The gas network connection point is normally pre-determined by the location of a Pre-laid
Service (PLS) or Pre-laid Service under Stairs (PLSS), prior to selecting an approved gas meter
box location.
To calculate the size of gas meter required:
1. Multiply the maximum megajoule/hr rating for each appliance by its applicable diversity factor;
2. Addallindividualappliancediversiedgasloadstogether;
3. Refer to gas meter selection table
Additional notes:
1. For more than two (2) continuous hot water systems, alternate 0.8 and 0.2 diversity factors for all remaining units.
2. You must apply diversity to all gas meter selections. Do not specify a gas meter larger than AL8 unless the gas
load exceeds 300MJ/hr after diversity has been applied.
GAS METER
DIVERSITY FACTORS
DOMESTIC GAS APPLIANCE DESCRIPTION
DIVERSITY FACTOR*
Gas pool/ spa heater
0.8
Gas hot water system - continuous type (highest MJ rated unit)
0.8
Gas hot water system - continuous type (2nd unit if tted)
0.2
Gas hot water system (storage type)
0.6
Gas room heater (portable, replace, ducted or other)
0.6
Gas clothes dryer
0.6
Gas hotplate/ oven/ BBQ (separate devices)
0.6
Gas cooker (combined hotplate with oven)
0.4
* Based on British Standard BS6400-1 as updated in accordance with the ATCO Gas Australia Technical Notice available at www.atcogas.com.au
Figure 2: Gas Meter Selection and Diversity Factors
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