necessary. Although some jurisdictions may <br />require that valves be low enough to reach without <br />a ladder, all minimum height requirements for <br />obstructions must be followed. <br />Valves for testing and draining purposes should <br />also be labeled. This will prevent any potential <br />confusion.' <br />Exterior valves should be placed in locations <br />accessible even during a fire incident. Wall-mount- <br />ed valves should be positioned no higher than 5 <br />feet above grade (ground level) and located at least <br />40 feet from openings such as windows, doors, or <br /> <br />IAN 0 <br />~m <br />611: <br />7 <br />_ I <br />yiu T CFi li3 ~ <br />{ <br />[:z:t~iTt TINS, V i <br />(Fig. 3.3) Exterior sign show- <br />ing valve location (in this case <br />for a standpipe system). <br />vents (Figure 3:4). Post indicator valves should be <br />at least 40 feet from the buildings they serve. The <br />40 foot distance is called for in NFPA 24, . <br />Designers should require proper notification <br />when their designs require systems, or portions of <br />systems, to be temporarily shut off. This would typ- <br />ically occur during system alterations, or phased <br />installations. In these instances, the design docu- <br />ments should require notification of any system <br />impairments to the responsible fire service organi- <br />zation and coordination with the fire service about <br />any requirements that these impairments may entail. <br />2 <br />X F - ' <br />L <br />~ A <br />CC h <br />~ VC! <br />r R -win Al; <br />i <br />x <br />. <br />- <br />3~ . <br />(Fig. 3.4) Wall control valve next to window. Fire issuing <br />from this window could prevent access to the valve. <br />Considerations - Water Supply Control Valves <br />■ Label all valves for specific. use or area cov- <br />ered. <br />■ Provide diagrams to show boundaries <br />between zones. <br />■ Locate interior valves in enclosed stairs <br />wherever possible, <br />. Provide signage.for valves that are outside <br />stairs or in concealed spaces. <br />■ Provide exterior signs showing the location <br />of interior valves. <br />■ Locate exterior post indicator valves 40 feet <br />from the building. <br />■ Locate exterior wall-mounted valves 40 feet <br />from openings and within. 5 feet of grade. <br />• <br />266 <br />3 O <br />J VZ 11 1 <br />'Occupational Safety and <br />Health Administration <br />146 <br />