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Ref. No.
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Subject of relaxation
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Schedule 2 Clause
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Terms of the Relaxation
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Conditions
applying to the relaxation
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Effective date
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1
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Shower (bidet) toilets for disabled users.
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Schedule 2(15)(3):
The device used to prevent backflow shall be appropriate to the
highest applicable fluid category to which the fitting is subject
downstream before the next such device.
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Each
Water Supplier to apply to the Secretary of State for a (non-site
specific) relaxation.
Subsequently, the Water Supplier can accept installations, subject
to the conditions, without further notice to the Secretary of
State. Water Suppliers
to maintain a database of sites where relaxations have been
utilised.
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1.
The unit must be fed
through a float-operated valve conforming with BS 1212 Parts 2 and
3.
2.
An appropriate warning
pipe should be fitted to discharge in a conspicuous position.
3.
The unit must be removed
when it is no longer required for the use of disabled people.
4.
The unit must be regularly
serviced under a formal servicing contract, copies of which must
be available on request to [water company] or through the water
company to the Secretary of State, should he so request.
5.
Failure to comply with
these conditions will invalidate the relaxation of the Regulations
and may result in requirements for the [name of device] to be
removed.
6.
The Secretary of State,
through [water company], must be informed when the unit is
removed.
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England:
from 9 Nov 1999
Scottish Water:
2 Feb 2011.
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2
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Internal
overflow in WC cisterns
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Schedule 25(1)(h): Every flushing cistern, not being a
pressure flushing cistern, shall be fitted with a warning pipe or
no less effective device.
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To relax the
Regulators’ WC Suite Performance Specification to allow the
installation of flushing cisterns in which the spillover level of
the internal overflow is between 20 – 25 mm and 42 – 50 mm above
the water line. This
is in addition to the 25 – 42 mm range permitted by the
Regulators’ WC Suite Performance Specification.
Where, in addition to an internal overflow installed
between 20 – 50 mm above the water line, a warning pipe is to be
provided, the spillover level of the warning pipe may be at any
height between 20 – 50 mm so long as it is no higher than the
spillover level of the internal overflow.
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All cisterns must still satisfy Requirement 4.2 of the Specification
relating to prevention of backflow.
The relaxation to be in force for five years.
[Note: September 2008: WRAS Technical Committee agreed on behalf of
Water Suppliers that WC
syphons complying with this relaxation be ‘deemed’ to meet the
requirements of the Regulations/Byelaws, subject to Defra raising
no objection.
Confirmed February 2009 that there was no objection by Defra or
the Bathroom Manufacturers Association.]
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England:
29 Dec 2000
Wales: 12 Feb 2001
Scottish Water:
2 Feb 2011
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3
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Mikrofill
device for backflow prevention
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Schedule 15(5):
A backflow prevention device is adequate for
the purposes of paragraph (1) if it is in accordance with a
specification approved by the regulator for the purposes of this
Schedule.
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To
permit the Mikrofill backflow prevention device as an acceptable
device for prevention of backpressure and backsiphonage of fluids
up to fluid category 4 in permanent installations for filling
sealed primary heating circuits, with or without additives, in
domestic and non-domestic premises.
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That where a water supplier so
requests, the manufacturer or supplier of Mikrofill will provide
the water supplier with details of all the devices ordered for
installation in that water supplier's area.
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England:
4 May 2001
Wales:
10 May 2001
Scottish Water Authorities:
March 2002.
Scottish Water: 2 Feb 2011
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4
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Dual and
interruptible flushing mechanisms retrofitted to ‘byelaws’ WC
cisterns
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Schedule 2(25)(6):
Notwithstanding sub-paragraph (1)(d) a flushing cistern installed
before 1st July 1999 may be replaced by a cistern which delivers a
similar volume and which may be either single flush or dual flush;
but a single flush cistern may not be so replaced by a dual flush
cistern.
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To
permit the retro-fitting of devices to permit dual flushing or
interruptible flushing of the WC to WC cisterns which were
installed legally before 1st July 1999.
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a The maximum
flush volume which the cistern delivers after modification must be
unaltered from that before conversion.
b Components
introduced to replace or modify the existing flushing control
mechanism must comply with the appropriate endurance requirements
of the Regulators’ WC Specification, as demonstrated by testing of
typical examples by a test facility that has relevant quality
assurance accreditation.
c Any cistern
whose modified method of flushing is permitted as a result of this
relaxation
(i) shall have a readily discernible method of actuating the flush
of different volumes; and
(ii) shall have instructions, clearly and permanently marked on
the cistern or displayed nearby, for operating it to obtain the
different flush volumes.
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England:
10 Jun 2003
Wales: 18 Jun 2003
Scottish Water Authorities:
24 Feb 2004;
Scottish Water:
2 Feb 2011.
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5
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Provision of
equivalent safety devices on unvented water heaters
[Note 2: The terms of this relaxation are superseded by those of
relaxation #6 below.]
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Schedule 2, Clause 17:
Every unvented water heater, not being an instantaneous
water heater with a capacity not greater than 15 litres, and every
secondary coil contained in a primary system shall-
(a)
be fitted with
a vent pipe, a temperature control device, a temperature relief
device and a combined temperature pressure and relief valve; or
(b)
be capable of
accommodating expansion within the secondary hot water system.
Clause 23(1):
A
temperature relief valve or combined temperature and pressure
relief valve shall be provided on every unvented hot water storage
vessel with a capacity greater than 15 litres.
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For
an unvented water heater with a primary storage system (greater
than 15 litres) which has no permanent connection to the water
supply (i.e. uses a temporary filling loop) or is supplied by a
permanent connection to the water supply via a Type CA backflow
prevention device, the requirement of Clauses 17 and 23(1) of
Schedule 2 of the Water Supply (Water Fittings) Regulations for it
to be provided with a temperature relief valve or combined
temperature and pressure relief valve, shall be deemed to be met
where alternative safety devices, with at least an equivalent
degree of safety in preventing the temperature of stored water
exceeding 100ºC, are provided in accordance with Section 3 of Part
G of the Building Regulations.
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The relaxation should be subject to a review of Part G of the
Building regulations which is currently taking place, and is
considering the area of unvented water heaters in greater detail.
[Note 1: Revised Part G building Regulations published in October
2009 and April 2010 did not alter the need for this relaxation.]
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England:
5 Dec 2005
Wales:
16 Jan 2006
Scottish Water
2 Feb 2011.
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6
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Provision of
equivalent safety devices on unvented hot water primary and
secondary storage systems.
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Schedule 2, Clauses 17, 18 and 23:
Clause 17: Every unvented water heater, not
being an instantaneous water heater with a capacity not greater
than 15 litres, and every secondary coil contained in a primary
system shall-
(c)
be fitted with
a vent pipe, a temperature control device, a temperature relief
device and a combined temperature pressure and relief valve; or
(d)
be capable of
accommodating expansion within the secondary hot water system.
Clause 23(1):
A temperature relief valve or combined temperature and pressure relief
valve shall be provided on every unvented hot water storage vessel
with a capacity greater than 15 litres.
Clause 18: Appropriate vent pipes, temperature control devices and
combined temperature pressure and relief valves shall be provided
to prevent the temperature of the water within a secondary hot
water system from exceeding 100°C.
Clause 23: (1) A temperature relief valve or combined
temperature and pressure relief valve shall be provided on every
unvented hot water storage vessel with a capacity greater than 15
litres.
(2) the valve shall-
(a)
be located directly on the vessel in an appropriate location, and
have a sufficient discharge capacity, to ensure that the
temperature of the stored water does not exceed 100°C; and
(b) only discharge water at below its operating temperature when
subjected to a pressure of not less than 0.5 bar (50 kPa) in
excess of the greater of the following-
(i)
the maximum working pressure in the vessel in which it is fitted,
or
(ii) the operating pressure of the expansion valve.
(3) In this paragraph "unvented hot water storage vessel" means a hot
water storage vessel that does not have a vent pipe to the
atmosphere.
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The
requirements of paragraphs 17, 18 and 23 of Schedule 2, regarding
the provision of safety devices for preventing the temperature of
water exceeding 100ºC in primary or secondary unvented hot water
storage systems, shall be complied with by the provision of safety
devices for the same purposes which satisfy the requirements of
Part G of the Building Regulations.
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England:
17 Aug 2011.
Wales: Requested; decision awaited.
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