What is a DC arrangement?
A Type DC arrangement comprises of a pipe interrupter with shrouded, permanently unrestricted air inlets (Type DC device) installed not less than 150 mm above the sparge outlet of a urinal or 300 mm (150 mm In Scotland) above the spillover of a WC pan or any other receiving vessel, discharging vertically downwards to an open outlet i.e. no method of flow control.
A Type DC arrangement is rated by the Regulators as suitable backflow protection against the highest level of contamination, fluid category 5 but for back siphonage only.
Type DC arrangement should be inspected, and as necessary maintained every 6 months (BS EN 806: 5)
Type DC device
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Uncontrolled if downloaded. This is informative, non-statutory guidance and intended for general guidance purposes only; it is subject to change.
Compliance with this information should not be relied upon as guaranteeing no enforcement action will be taken by water undertakers. Water Regs UK accepts no liability for loss, indirect or consequential loss arising from or in connection with this guidance document.