Plumbing - Separation of services - Connections magazine

This table relates to the article - Separation of common services which was published in Connections magazine - Issue 18 (November 2020).

Table 1 - Summary showing separation distances (in mm) between different below ground services
Below Ground services (General advice only based on the AS3500 series) Applies to A and B		Water Service supply (Connected to Drinking Water Supply)			Drainage		Gas	Electricity
A.	Yes	Cold Water AS3500.1:2018 Clause 5.2 (Drinking water)		Heated Water	Under-ground sanitary drainage	Under-ground stormwater drainage	Consumer gas pipe	Low Voltage Electrical Supply Cable
B.	Yes	Not greater than DN65	Not greater than DN65	AS3500.4 :2018 Clause 4.2.	AS3500.2 :2018_V3 Clause 3.6	AS3500.3 :2018 Clause 6.2.6	AS5601.1 Clauses 5.4	AS3000 Clause 3.11.5
Non-Drinking water AS3500.1 Clause 9.3.2.2	Identified by an purple marker tape laid 150mm above the installed pipe to AS/NZS26248.1	300	300	300	100	300	100 for </= DN65 or 300 for >DN65	100 for </= DN65 or 300 for >DN65
Consumer gas pipe AS5601.1 Clauses 5.4	Identified by an orange marker tape laid 150mm above the installed pipe to AS/NZS26248.1 and mechanically protected	100	300	100	100	100	N/A	100
Consumer gas pipe AS5601.1 Clauses 5.4	Neither indicated nor mechanically protected	600	600	600	600	600	N/A	300
Low Voltage Electrical supply cable AS3000 Clause 3.11.5	Identified by an orange marker tape laid 150mm above the installed pipe to AS/NZS26248.1 and mechanically protected	100	300	100	100	100	N/A	100
Low Voltage Electrical supply cable AS3000 Clause 3.11.5	Neither indicated nor mechanically protected	600	600	600	600	600	N/A	300
Underground sanitary drain AS3500.1 Clause 5.2.6 See Figure 5.2.6		100	100	100	100	300	N/A	N/A
Communication cable AS3500.1 Clause 5.2.5		100	100	100	100	100	N/A	N/A

Notes:

Minimum separation of conductive enclosures to low voltage earthing electrode 500mm for water, sanitary drainage and gas and 600mm for stormwater drainage.
Low voltage is voltage that exceeds extra-low voltage (not exceeding 50 V ac. or 120 V ripple-free dc.) but not exceeding 1000V ac. or 150 V dc.

Last updated: 06 Sep 2023

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Plumbing - Separation of services - Connections magazine - Issue 18 (November 2020) addendum

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