Code 3Check. Sixth Edition. INTRODUCTION u CODES u ABBREVIATIONS

Transcription

1 INTRODUCTION u CODES u ABBREVIATIONS Code 3Check Sixth Edition By Douglas hansen & Redwood Kardon Illustrations & layout by Paddy Morrissey 2009 by The Taunton Press, Inc. ISBN XX X-XXXXX-XXX-X ISBN 13 XXX-X-XXXXX-XXX-X Code Check is a trademark of The Taunton Press, Inc., registered in the U.S. Patent & Trademark Office. Code Check is a field inspection guide to important code requirements and common code violations in the construction of singlefamily and two-family dwellings. The primary reference document for this book is the 2009 edition of the International Residential Code for One- and Two-Family Dwellings, published by the International Code Council. Codes are adopted at different times in different places around the country. New editions come out every three years, and some states make extensive modifications to the model codes prior to adoption. Because the actual code that is used in a particular area could vary, we include references to the two most commonly used codes for every item in the book. Significant code changes are highlighted in the text and summarized on the inside back cover. If you are in an area that uses an older code, these highlighted changes and the summary help determine the applicable code rules. For users in areas where the 2006 IRC is still in effect, the building section of the book cites both the 2006 and 2009 references. To determine the particular codes in effect in your area, contact your local building department and check our web site at For updates to this book, and other valuable news, articles, and information, visit Table 1 Codes Referenced in Code Check Organization Code ICC 2006 & 2009 IRC International Residential Code IAPMO 2009 UPC Uniform Plumbing Code IAPMO 2009 UMC Uniform Mechanical Code NFPA 2008 NEC National Electrical Code The code changes referenced on the inside back cover compare the codes in this table to the 2006 IRC, UPC, UMC & 2005 NEC Abbreviations A = amp(s) (ex: a15a breaker) ABS = acrylonitrile-butadiene-styrene plastic pipe ACH = Air Changes per Hour ACI = American Concrete Institute AHJ = Authority Having Jurisdiction AMI = in accordance with manufacturer s instructions ASTM = American Society for Testing & Materials AWG = American Wire Gauge B (vent) = gas appliance vent - usually double-wall BO = Building Official Btu = British thermal unit CATV = Cable Television cfm = cubic feet per minute CPVC = chlorinated polyvinyl chloride plastic pipe CSST = corrugated stainless steel tubing cu. = cubic (ex: 24cu.ft) Cu = copper CWV = combination waste & vent DFU = drainage fixture unit(s) DW = dishwasher DWV = drain, waste & vent e.g. = for example (exempli gratia) EGC = equipment grounding conductor EMT = electrical metallic tubing ex: = example FLR = flood level rim FMC =flexible metal conduit ft (after number) = foot, feet-ex: 5ft FVIR = flammable-vapor ignition-resistant galv = galvanized GEC = grounding electrode conductor GPM = gallons per minute hp = horse power IMC = intermediate metal conduit ICF = insulating concrete forms in (after number) = inch(es)(ex: 24in) IS = IAPMO Installation Standard kw = kilowatt L&L = listed & labeled lav = lavatory (bathroom sink) LFMC = liquidtight flexible metal conduit ( sealtight ) LFNC = liquidtight flexible nonmetallic conduit manu = manufacturer max = maximum min = minimum mph = miles per hour n/a = not applicable NM = nonmetallic sheathed cable O.C. = on center PEX = cross-linked polyethylene plastic pipe (water pipe) PL = property line psf = pounds per square foot psi = pounds per square inch psig = pounds per square inch gauge PT = Preservative-treated (wood) PVC = polyvinyl chloride plastic water pipe or electrical conduit recep = receptacle outlet (electrical) RMC = rigid metal conduit SDC = Seismic Design Category SDC D = SDC D 0, D 1, & D 2 SE = service entrance sq. = square (ex: 24sq.in) UL = Underwriter s Laboratories, Inc. W = electrical conductors rated for wet location w/ = with w/o = without WC = water closet WH = water heater WSFU = water supply fixture unit(s) Benjamin Franklin - our inspiration model code organizations ICC = The International Code Council IAPMO = International Association of Plumbing and Mechanical Officials NFPA = National Fire Protection Association For web links, visit The IRC is a prescriptive guide to residential construction. Construction beyond the scope of the IRC typically requires a design professional in a particular field. The IRC contains extensive detail on methods for steel framing, insulating-concrete forms (ICF), log construction, and structural insulated panels (SIPS), as well as details on conventional building techniques. We encourage readers to use our book as a guide to locating material within the IRC, rather than as a substitute for it. When special techniques are required for aspects of a construction project, the building official may require special inspections from an approved agency, which is often an engineering firm. Table 2 Special Inspection Reports S.I. reports due before final inspection Required Received Concrete >2,500 psi Pilings, drilled piers & caissons Reinforced concrete / masonry Insulating concrete form walls Post-tensioned concrete High-strength bolting Structural welding/steel moment frames Air infiltration Energy compliance Special case:

2 FIG. 3 Foundation & Storm Drainage Holes go down. 45 Rigid perforated drain pipe Table 3 Reinforcing Steel Cover [ ] Foundation Surface Concrete cast against & permanently exposed to earth Min. Cover #5 bars Downspout Min. Cover #6 bars 3 in. 3 in. Concrete exposed to earth or weather 1 1 /2 in. 2 in. Drain adapter 6-mil plastic on house side (recommended) Non-perforated pipe, sloped downhill & separate from foundation drain pipe Filter fabric Rebar 06 IRC 09 IRC n SDC D footings req reinforcement min 3in from bottom_ [ ] { } n SDC D #4 vertical bar 4ft O.C. req d if construction joint between footing & stem wall or between footing & grouted CMU wall [ ] { } n SDC D #4 horizontal bar req d top of stem wall & 3in to 4in from bottom of footing F4 [ ] { } n Clearance to forms & soil T3 [n/a)] { } 4 n Lap splices min 20in #4bar, 25in #5 bar, 30in #6 bar F4_ [n/a)] { } 5 n Max gap between parallel bars 6in & 1 /5 splice lap length [n/a] { } 6 Not exposed to weather, ex: top of indoor slab 3 /4 in. 3 /4 in. up to #11 bars Plates & Sills 06 IRC 09 IRC n Masonry veneer ledge 4in above earth, wood sill 6in min_[ ] { } n Sill PT or decay resistant if 8in above exposed ground [319.1] {317.1} n PT wood fasteners req hot dipped galv, stainless steel, silicone bronze, or Cu [except bolts 1 /2in diameter] [319.3] { } Anchor Bolts n Req d for wood sills & for monolithic slab sole plates EXC_ [ ] { } Other anchoring methods equivalent to 6ft O.C. bolts [ X1] { X1} n Req d for interior braced walls of monolithic slab [n/a] { } n Bolts must be in concrete or grouted cell of CMUs [n/a] { } 7 n Max spacing 6ft O.C. [ ] { } n Min 2 bolts per plate section, min 7in embedment [ ] { } n Max 12in & min 7 bolt diameter from end of sill F4 [ ] { } n SDC D & light-frame townhouses in SDC C: n Max spacing 4ft O.C. for >2 story [ ] { } n Plate washers req d at braced wall lines [ ] { } FIG. 4 Anchor Bolts & Hold- Downs Hold-down Anchor bolt Anchor bolt must be within 12 in. of end of sill plate Bolt holder & form Choose hold-down bolt size & depth from catalog to meet req d uplift force Some holddowns must be throughbolted to posts. Holddowns help secure the structure from seismic & wind forces. BUILDING LOCATION u DRAINAGE u FOUNDATION u REBAR 2

3 Floor framing Girders 06 & 09 IRC n Girder end joints must be over supports or on hangers [502.6] n Min bearing 1 1 /2 in on wood, 3in on concrete [502.6] n Post & beam joints req positive connection [502.9] n Max horizontal offset under perpendicular bearing walls = depth of joist F6 [502.4] n Notching & boring sawn lumber F7 [ ] n Notching & boring engineered lumber AMI F8 [ ] FIG. 6 Bearing Wall Suppport Joists 06 IRC 09 IRC n Joist spans not to exceed max numbers in T5 [502.3] {502.3} n Min bearing 1 1 /2in on wood or metal, 3in on concrete [502.6] {502.6} n Joists into side of girder req hanger or min 2 2 ledger_[ ] { } n Joist lap min 3in & 3 10d nails [ ] { } n Double joists under parallel bearing walls [502.4] {502.4} n Prevent rotation of joists (blocking or hangers at ends) _ [502.7] {502.7} n Manufactured lumber lateral restraint AMI F8 [n/a] {502.7X1} 11 n Blocking at intermediate supports SDC D [502.7X] {502.7X2} n Joists >2 12 blocked or bridged max 8ft O.C. [ ] { } n Notches & holes per F7 [ ] {x } n Modification of trusses, I-joists, structural composite lumber, or glue lams only AMI or per design professional F8 [ ] { } Bearing walls should not offset more than 1 joist depth from the supporting girder or wall below the floor. FIG. 7 Notching & Boring No notching in middle 1 3, holes OK Notch max. 1 6 depth Joist depth Max. distance Table 5 JOIST Span, Notching & boring [T (2)] & [ ] Floor Joist Spans 40lb. Live Load Notching Boring Size A 12 in. o.c. 16 in. o.c. 24 in.o.c. End Outer 1 /3 2 in. to edge DF 2x6 10 ft. 9 in. 9 ft. 9 in. 8 ft. 1 in. SP 2x6 10 ft. 9 in. 9 ft. 9 in. 8 ft. 6 in. 1 3 /8 in. 7 /8 in. 1 1 /2 in. DF 2x8 14 ft. 2 in. 12 ft. 7 in. 10 ft. 3 in. SP 2x8 14 ft. 2 in. 12 ft. 10 in. 11 ft. 0 in. 1 7 /8 in. 1 1 /2 in. 2 3 /8 in. DF 2x10 17 ft. 9 in. 15 ft. 5 in. 12 ft. 7 in. SP 2x10 18 ft. 0 in. 16 ft. 1 in. 13 ft. 1 in. 2 3 /8 in. 1 1 /2 in. 3 1 /8 in. DF 2x12 20 ft. 7 in. 17 ft. 10 in. 14 ft. 7 in. SP 2x12 21 ft. 9 in. 18 ft. 10 in. 15 ft. 5 in. 2 7 /8 in. 1 7 /8 in. 3 1 /2 in. A. DF = Douglas Fir-Larch #2, SP = Southern Pine #2, Notch at end 1 4 of depth max. FIG. 8 Manufactured I-joists Hole sizes and distances to bearing points AMI Holes min. 2in. from top, bottom, or other holes, max size 1 3 depth. No notching at bottom if 4 in. thick, except at ends Outer 1 3 Min in. gap Squash blocks Min in. end bearing (or AMI) BUILDING FOOTING u BUILDING SLABS u CMU u FLOOR FRAMING 4

4 PLUMBING 13 automatic fire sprinkler systems 45 General 09 IRC n IRC 2904 considered equivalent to NFPA 13D [2904.1] n Stand-alone system = independent from potable water [2904.1] n Multipurpose system = shared w/ potable water system [2904.1] Required Occupancies n Req d in townhouses EXC [313.1] Additions to existing townhouses w/o sprinkler systems [313.1X] n Req d in 1- & 2-family dwellings effective January 1, 2011 EXC [313.2] Additions to existing dwellings w/o sprinkler systems [313.2X] Protected Areas n Protect all areas of dwelling unit EXC [ ] Attics, crawlspaces w/o fuel-fired appliances [ X1] Gypboard-surfaced closets 24sq. ft w/ smallest dimension 3ft_[ X2] Bathrooms 55sq.ft [ X3] Garages, carports, exterior porches, unheated entry areas, etc. _[ X4] n Req d in attic or crawl directly over fuel-fired equipment [ X1] Sprinkler Heads n Basic coverage area AMI & not >400sq.ft [ ] n Install additional sprinklers when obstructed: [ ] Ceiling (pendant) sprinklers 3ft of ceiling paddle fan [ ] Sidewall sprinklers within 5ft of ceiling paddle fan [ ] n Basic temperature rating 135 F & 170 F [ ] n Intermediate temperature sprinklers (175 F F) req d in attics, under skylights, in concealed spaces beneath roof, and per T13 [ ] TABLE 13 Type of Heat Source Min. DISTANCES BETWEEN HEAT SOURCES AND SPRINKLER HEADS [T ] Distance to Ordinary Temperature Sprinklers Distance to Intermediate Temperature Sprinklers Side of open or recessed fireplace 36 in. 12 in. Front of recessed fireplace 60 in. 36 in. Coal & wood burning stoves 42 in. 12 in. Kitchen range top 18 in. 9 in. Oven 18 in. 9 in. Vent connector or chimney connector 18 in. 9 in. Uninsulated heating duct 18 in. 9 in. Uninsulated hot water pipe 12 in. 6 in. Side of ceiling or wall warm air register 24 in. 12 in. Front of wall mounted warm air register 36 in. 18 in. WH, furnace, or boiler 6 in. 3 in. Luminaire up to 250 watts 6 in. 3 in. Luminaire >250 watts to 499 watts 12 in. 6 in. Distances are measured in a straight line from nearest edge of heat source to nearest edge of sprinkler Sprinkler Piping System 09 IRC n Support per T16 [2904.3] n PEX & CPVC req listing as sprinkler pipe [ ] n Nometallic pipe protected behind15-min finish in living areas [ ] n No shutoff valves after main F22 [ ] n Provide means to drain down system F22 [ ] Flow Rates n Determine rate for each sprinkler based on manufacturer s data [ ] n Rate for room w/ 1 sprinkler = rate for that sprinkler [ ] n Rate for room w/ 2 sprinklers = 2 highest rated sprinkler [ ] n System design flow rate based on room w/ largest flow rate [ ] n Flow rate for non-smooth ceilings AMI [ ] n Water supply calculation based upon available pressure, pipe size loss, meter loss, elevation change, & length [2904.5&6] Signage & Inspections n Owner s manual to be provided to the owner [2904.7] n Sign at main shutoff F23 [2904.7] n Pre-concealment inspection req d [ ] n Final sprinkler inspection req d [ ] FIG. 22 Fire Sprinkler System Waterflow detector City water main FIG. 23 City gate valve Required Fire Sprinkler Warning Sign Fire sprinkler system pressure gauge Water meter Automatic fire sprinklers Drain & test connection Domestic shutoff valve (manual) Supply pressure gauge Main control valve

5 PLUMBING 17 gas piping General 09 IRC 09 UPC n Locate gas meter in accessible & ventilated space [utility] { A} n Main shutoff req d outdoors at each building [2420.2&3] { } n Material: steel (galv or black), type K or L Cu, CSST _[ ] { } n Cu only OK for low sulfur-content gas [ ] { } n Plastic only OK underground [ ] { A} n Cu joints brazed (not soldered) [ ] { } n Size pipe per tables T17-19 [2413.3] {1217.1} n Interior of pipe or tubing must be deburred [2414.7] { } n No gas pipe in circulating or ventilating air duct [2415.1] { } n Outdoor piping min 3 1 /2in above ground or roof [2415.7] {n/a} n Underslab only if run through gas-tight conduit [ ] { } n No unions or bushings in concealed locations [2415.3] { } n Shutoff ahead of each medium pressure regulator F34_[2420.4] { } n Drip legs at low points if water vapor in gas F34 [2419.2] { } Electrical Bonding n Gas pipe not OK as grounding electrode in earth [2410.1] { } n Electrically bond above-ground metal gas pipes [2411.1] { } n Appliance EGC sufficient to bond non-csst gas pipe_[2411.1] { } n Bond CSST where gas service enters building [ ] 54 { } 54 n CSST bonding jumper min 6AWG Cu [ ] 54 { } 54 Appliance Shutoffs & Connections n Shutoff valve ahead of union & 6ft of appliance EXC_[ ] {1212.5} 50ft OK if valve at manifold [ ] 55 {Ø} n Max length connector 6ft [ ] 56 {1212.5} n Flex connectors completely in same room as appliance_[2422.1] {1212.1} n Connector not through appliance housing EXC [ ] {n/a} OK w/ hard pipe, connectors protected against damage, & fireplace inserts w/ grommets AMI [ X] 57 {n/a} n Sediment trap close as practical to appliance EXC [2419.4] {1212.7} Ranges, clothes dryers, fireplaces, & gas lights [2419.4] {1212.7} FIG. 35 Piping Protection Table 17 2 in. IRC Protect pipe when < 1 1 /2 in. from stud or joist edge (1 in. UPC) Min. extension 1 1 /2 in. past edge of hole in UPC Procedures for Sizing Gas Pipe [ ,2] & { ,2} 1. Determine Btu/cu.ft. gas from local supplier (usually 1100). 2. Divide appl Btu by Btu/cu. ft. to obtain appl demand. 3a. Longest length method: Measure developed length to most remote outlet. 4a. Longest length method: Use column from T19 for most remote fixture for all outlets 3b. Branch length method: Measure developed length to each outlet 4b. Branch length method: select column from T19 for load on piping to each outlets 5. Select row for pipe size equaling or exceeding demand each section TABLE 18 Gas Sizing Fill-in table Section Length Cu. ft./hr. Pipe Size FIG. 34 CSST Manifold 1 /4 turn ball valve Multi-port manifold Union CSST is regulated by American National Standards Institute ANSI/IAS LC /CSA 6.26-M97 Fuel Gas Piping Systems Using Corrugated Stainless Steel Tubing (CSST). The standard requires that a contractor be certified before installing CSST. Pressure regulator Drip Table 19 Gas Piping [T2413.4(1)] & {T12-8} Length (in feet) Pipe Demand Capacity (in cu.ft./hr) 1 2in in in in in

6 venting General (Gravity Gas) 09 IRC 09 UMC n Install vents AMI (most appliances ship w/ GAMA venting tables which include limits for size, length, & offsets) [ ] { } n Induced-draft (Category I) can be gravity vent T21 [2427.1] { } n Vent size draft hood size & 7 draft hood size [ ] { } n One 60 offset OK, others max 45 EXC [ ] { } Systems designed using vent sizing tables [ ] { X} n Provide proper support AMI [2426.6] { } n Insulation shield to min 2in above attic insulation F57 [2426.4] {manu} n No solid fuel & gas in same chimney flue [ ] { } n Vents <1 1 /2in from face of framing req steel plate protection extending 4in beyond edge of framing member [2426.7] {n/a} Table 21 Connectors Connectors short & straight as practical F57 [ ] { } Basic max horizontal length 18in per in of diameter _ [ ] { } Single-wall connector max length 75% of vertical vent_[ ] { } Type B connector max length 100% of vertical vent_[ ] { } Max 2 diameter of vent collar or draft hood [ ] { } No single wall in attics & cold areas EXC [ ] { } Within building w/ 99% winter design temp 5 F_[ X] { X} No single-wall connector through floor, ceiling or wall_[ ] { } Slope min 1 /4in/ft toward appliance F57 [ ] { } Connect to appliance vent collar w/ screws or AMI_ [ ] { } Appliances with Common Venting 09 IRC 09 UMC 2 draft-hood equipped appliances: common connector largest connector + 50% of smaller flue collar outlet size_[ ] { } Join to common connector as high as possible F57_ [ ] { } Smaller connector above larger connector when entering vent at different levels EXC F57 [ ] { } Connectors 45 of vertical may enter vent at same level_[ ] { } Vent for 2 natural draft appliances min size = outlet of larger appliance plus 50% of smaller, max 7 size of smaller one F57 [ ] { } FIG. 57 Venting Appliance Venting Categories Category Condensation Static Pressure Typical vent I No Negative B Vent II Yes Negative per Manu III No Positive Stainless IV Yes Positive Plastic Smaller appliance connector as high as possible per available headroom before offsetting horizontally Smaller appliance connector enters vent above larger connector Openings into vent at same level max. 45 from vertical Single Wall Vent 09 IRC 09 UMC Not allowed in dwellings [n/a] { } 65 Only for runs from appliance space directly to outside_[ ] { } May not originate in attic or pass through inside wall [ ] { } Min 6in clear to combustible for single wall pipe [ ] { } B Vent Termination n Must extend above roof [ ] { } n Type B or L termination min 5ft height from flue collar _[ ] { } n Min 2ft above vertical surface within 8ft F58 [ ] { } n Min 1ft above roof T22 [ ] { } n Per table for roofs steeper than 6:12 T22 [ ] { } FIG. 58 Gas Appliance Vent Terminations If vent is closer than 8 ft. to the wall, the vent must terminate at least 2 ft. above roof edge. Termination height, see T29 8 ft. 2 ft. min. <8 ft. Table 22 Termination of B & BW Vents [F ] & {F 8-2} Roof Slope Height above Roof up to 6/12 1ft. >6/12 to 7/12 1ft. 3in. >7/12 to 8/12 1ft. 6in. >8/12 to 9/12 2ft. >9/12 to 10/12 2ft. 6in. >10/12 to 11/12 3ft. 3in. >11/12 to 12/12 4ft. >12/12 to 14/12 5ft. >14/12 to 16/12 6ft. >16/12 to 18/12 7ft. >18/12 to 20/12 7ft. 6in. Forced Vents (Category IV) n All mechanical draft systems L&L & installed AMI [ ] { } n Forced draft system must be gas tight [ ] { } n No natural & forced-vent to common flue [ ] { } n Terminate min 4ft to side or below or 1ft above building openings, min 1ft above ground level, & 3ft above forced air inlets EXC [2427.8] { &2} Termination can be same as direct vent (p.23) if AMI_ [2427.8] { &2} n Collect & dispose of condensate from vent (p.23) [2427.9] {802.9} Gas Vent Entering Masonry Chimney n Enter chimney min 12in from bottom (above bottom UMC} _[2425.9] {Ø} n Must be lined w/ clay or metal EXC [ ] { } Not req d when replacing appliance of similar type & rating & if chimney inspected for damage [ ] { } n Cross-sectional area not >7 size of gas vent [ ] { } Direct Vent Termination: 0-10K Btu/hr min 6in clearance to building openings [2427.8] { } 10K-50K Btu/hr min 9in [2427.8] { } >50K Btu/hr min 12in [2427.8] { } 12in clearance to finished ground level [2427.8] { } MECHANICAL COMBUSTION AIR u VENTING 22

7 MECHANICAL 23 appliances Heat Pump Outdoor Units & AC Condensers 09 IRC 09 UMC Evaporator downstream from furnace heat exchanger [1411.2] {904.8B} Outdoor condenser on raised level base [1401.4] {manu} Secure in place (seismic restraint) [1401.4] {303.4} Electrical disconnect req d within sight F70 [4101.5] {NEC} Working space on control side min 30 30in [1305.1] {304.0} Condensate Control (AC & Condensing Furnaces) F59 Condensate drain req d w min 1 /8in/ft slope_[ & ] 66 {309.1} Cat. IV furnace condensate same rules as AC [1411.4] {309.1} Condensate may not drain to public way [1411.3] {309.1} Downflow units req blockage detector in primary pan_ [ ] {904.8D} May drain to indirect receptor (lav tailpiece, tub overflow)_[local] {309.1} Protect from condensate overflow w/ one of following: Secondary drain line higher than primary drain [ ] {309.2} Drain pan w/ drain pipe under equipment [ ] {309.2} Drain pan w/ interlocked detector [ ] {n/a} Water level detection device interlock to equipment_[ ] {n/a} Secondary discharge to readily observable location_ [ ] {309.2} Secondary drain piping min 3 /4in & 1 /8in/ft slope} [ ] {309.1&2} FIG. 59 Secondary drain OR pan Built-in Range/Cooktop Vertical clearance to combustibles 30in [1901.1] {916.2B} Reduced clearance OK if L&L & AMI [1901.1] {916.2B} {24in vertical clearance OK w/ sheet metal over millboard}_[n/a] {916.2B} Horizontal clearance per manu [1901.2] {916.2C} Unvented Room Heaters (not allowed in some states) Not OK as sole heat source [2445.2] {924.1} Max 6kBtu in bath, 10kBtu in bedroom [2445.4] { X} Min combustion air 50cu.ft/1kBtu (see p.22) [2445.5] {924.1} Oxygen depletion safety system req d [2445.6] {local} Wall furnaces Condensate Control All drains req. 1 /8 in./ft. slope Air handler or condensing furnace Primary pan (built-in) Vent Primary drain Clearances & Installation 09 IRC 09 UMC n Install AMI [2436.1] {928.1A} n Side & top clearance req d to prevent ignition hazards_ [2436.3] {928.2} n Door swing [min 12in IRC] may not cause hazard [2436.4] {928.2} n Door stops not OK as means of providing clearance [2436.4] {n/a} n Room or space must have adequate combustion air [2407.5] {928.3} n No ducts attached to wall furnaces [2436.5] {928.1A} n BW vent termination min 12ft from base of furnace [ ] { } n Vented firestop spacer header of first floor & single story_[2436.1] {928.1C} n Closed firestop spacers AMI at subsequent ceilings [2436.1] {928.1C} Exhaust Systems Electric Clothes Dryer Exhaust 09 IRC 09 UMC n L&L ductless (condensing) dryers OK per L&L [1502.2X] {n/a} n Closet installation req s make-up air opening min 100sq.in_[n/a] { ) n Flexible transition ducts (connectors) L&L & single piece_[ ] { X} n Connectors not concealed & max 8ft {6ft UMC} F60_[ ] { X} n Duct smooth metal, no screws in air flow F60 [ ] { } n Support intervals max 4ft spacing [ ] 67 {n/a} n Duct min 4in diameter [ ] 68 { } n IRC: Max length AMI or 25ft minus bends per T23_ [ ] 69 {n/a} n UMC: Max length 14ft minus 2ft each 90 turn more than 2_[n/a] { } n No mixing w/ or passage through other systems [1502.1] { } n End outside in backdraft damper & no screens F61 [1502.3] { } n Min 3ft from other building openings [1502.3] {n/a} n Shield plates if <1 1 /4in from framing surface F35 [1502.5] 70 {n/a} n Length of concealed duct on tag 6ft of connection_[ ] 71 {n/a} FIG. 60 If duct length based on manu instructions, copy must be provided to AHJ & inspect duct NOTICE Concealed duct length 29 ft. Dryer Exhaust UMC length 14 ft., up to 2 90 bends, deduct 2 ft. for each additional 90 IRC length 25 ft for electric, 35 ft. for gas or AMI Deduct for bends T23 Transition ducts metal, L&L, and not concealed No screens TABLE 23 DRYER FITTING EQUIVALENT LENGTH [T & T ] Fitting Radius Equivalent Length 45 Elbow 90 Elbow 4 in. mitered 2 ft. 6 in. 5 ft. 6 in. smooth 1 ft. 1 ft. 9 in. 8 in. smooth 1 ft. 1 ft. 7 in. 10 in. smooth 9 in. 1 ft. 6 in. FIG. 61 Backdraft Damper Gas Clothes Dryer Exhaust n Closet req s make-up air opening [min 100sq in IRC] [2439.4] {905.3A) n Flexible transition ducts (connectors) L&L & single piece_[ ] {905.4C} n Connectors not concealed [& max 8ft in IRC] F60 [ ] {905.4C} n Duct smooth metal, no screws in air flow F60 [ ] {905.4B} n Support intervals max 4ft spacing [ ] 67 {n/a} n Duct min 4in diameter [ ] {n/a} n Max length AMI or 35ft minus bends per T23 [ ] 72 {n/a} n No mixing w/ or passage through other systems [2439.1] {905.4A} n End outside in backdraft damper & no screens F61 [2439.3] {n/a} n Length of concealed duct on tag 6ft of connection_[ ] 71 {n/a} Range Hood Ducts n Backdraft damper & outdoor termination req d EXC [1503.1] {504.1&2} Ductless range hoods OK per L&L [1503.1X] {303.1} n Must be metal w/ smooth interior EXC [1503.2] {504.2} PVC OK for downdraft duct under slab [1503.2X] {504.2X} n Provide makeup air if exhaust system >400 cfm [1503.4] 73 {n/a}

8 ELECTRICAL 25 Panelboards (load centers) General 09 IRC 08 NEC n Working space 30in wide x 3ft deep min F63 [3405.2] {110.26A1&2} n Working space to floor & min 6ft 6in height F63 [3405.2] {110.26A3} n No grounding of neutral after service EXC F65 [3607.2] {250.24A5} 74 Existing separate structure w/ no parallel metal path_[ ] 75 {250.32BX} 75 n No bonding subpanel neutral to enclosure F65 [3908.6] {408.40} n Only 1 wire per breaker unless L&L for 2 [3406.9] {110.14A} n Each neutral req s individual terminal [3706.4] {408.41} n Overcurrent protection req d per tables T26 [3705.5] {240.4} n All terminals torqued per labeling [3403.3] {110.3B} n Breaker brand and models L&L for panel [3403.3] {110.3B} n Use of each circuit legibly identified w/ sufficient detail to distinguish use from all other circuits [3706.2] {408.4} n Circuit description not dependent on temporary conditions, e.g., room color or occupant s name [3706.2] 76 {408.4} 76 n Multiwire circuits req handle tie or single handle F65 [ ] 77 {210.4B} 77 n Unused openings closed equivalent to original [3404.6] {110.12A} n Max height of center of breaker handle 6ft 7in [3705.7] {240.24A} n No panels in clothes closet or bathroom [3705.7] {240.24D&E} n Not to be located over steps of a stairway [3705.7] 78 {240.24F} 78 n 1 /4in air space req d behind surface-mounted metal panel in damp or wet location [3907.2] {312.2A} FIG. 64 FIG. 65 Neutral Service conductor Panel identified Subpanel (white tape encircling end of conductor) FIG. 66 GEC Bond all available electrodes together. GEC must connect them to the service neutral. Clamps n Ground rod clamps L&L for direct burial [3611.1] {250.70} n Clamps accessible unless buried or encased [3611.2] {250.68A} Grounding Electrode Conductor (GEC) n GEC must connect to incoming service neutral [3607.2] {250.24A} n 8 AWG req s protection in raceway or cable armor [3610.2] {250.64B} n 6 AWG following building contour OK w/o protection_[3610.2] {250.64B} n Size GEC to T25 EXC [T3603.1]] {250.66} 6 AWG largest req d size if dead-ends at rod [T3603.1] {250.66A} n 4 AWG largest req d size if dead-ends at Ufer [T3603.1] {250.66B} Table 25 Grounding Electrode System (GES) 5 ft. max. #4 Cu 20ft. Ufer = 20 ft. #4 rebar GEC [T3603.1] & {T250.66} Min. Grounding Conductor Sizes Rod min. 8 ft. below grade & driven flush EGC [T ] {T } EGC LINE SIDE LOAD SIDE Bond neutral in service enclosure Do not bond neutral in subpanel. Cu Service Wire AWG Size Max Service Rating Size of Cu GEC A Al Service Wire AWG Size Breaker Rating AWG Size of Cu EGC B 2 1/ or 1/0 2/0 or 3/0 150/ /0 or 3/0 4/0 or 250kcmil 200/ >3/0 to 350kcmil >350kcmil to 600 kcmil >250kcmil to 500 kcmil >500 kcmil to 900 kcmil 250/ / See Code Check Electrical for Al GEC sizes. B. Al EGCs 1 size larger than Cu. grounding & bonding 2 circuits to common yoke & multiwire circuits req handle tie or single-handle 2-pole breaker. Grounding Electrode System (GES) F66 09 IRC 08 NEC n Use metal underground water pipe if 10ft in earth_[ ] {250.52A1} n Connect GEC to pipe not >5ft inside building [ ] {250.52A1} n Bond around removable equipment (meters, etc)_[ ] {250.53D1} n Water pipe cannot be only grounding electrode [ ] {250.53D2} n Ufer =20ft #4 rebar or 4AWG Cu wire in concrete footing, foundation, or pier in contact w/ earth EXC [ ] {250.52A3} Ufer not req d in existing buildings where steel not accessible w/o removal of concrete [3608.1X] {250.50X} n Ground rod min 8ft [ ] {250.52A5} n Ground rod min 8ft deep & driven flush [ ] {250.53G} n If resistance >25ohms, 2nd rod req d 6ft from 1st_ [3608.4] {250.56} n Each structure w/ >1 branch circuit require GES [3607.3] {250.32A} Bonding n Bond all available electrodes (water piping, rod, Ufer)_[3608.1] {250.50} n Bond lightning protection to grounding electrode system_[n/a] { } n Bond metal raceways enclosing GEC [3610.3] {250.64E} n Bond service raceway fittings w/ bonding jumpers if knockouts remain, use bonding locknuts if no remaining concentrics [3609.4] {250.92B} n Bond metal piping, hot, cold, & gas [3609.6&7]{ A&B} n EGC of equipment may be used to bond gas [3609.7] { B} Intersystem Bonding n Provide accessible external terminal bar w/ min 3 terminals to bond phone & CATV [3609.3] 79 {250.94} 79 n Bar not to interfere w/ opening service enclosure [3609.3] 79 {250.94} 79 Equipment Bonding & Grounding n Wire EGCs sized per T25 [ ] { } n EGC must provide effective ground-fault current path_[3908.4] {250.4A5} n Earth is not an effective ground-fault current path [3908.5] {250.4A5} n RMC, IMC, EMT, AC cable armor, electrically continuous raceways, & surface metal raceways OK as EGC [ ] { A} n Remove paint from contact surfaces of ground bars_[ ] {250.12}

9 ELECTRICAL 29 TABLE 28 Load Calculations [T3704.2(1)] {220.40} General Lighting & Receptacle Loads Sq. ft. 3VA Small Appliance & Laundry Loads 2 small appliance circuit 3,000 Laundry circuit 1,500 Subtotal general light, small appliance & laundry First 100% 3,000 3,000 35%.35 = Special Appliance Loads Range 8,000 up to 12kW nameplate Dryer 5,000 (or nameplate if >) Heating or Air 100% Appliances Fastened in Place WH Microwave DW Disposer Other Subtotal SWIMMING POOL General 09 IRC 08 NEC n Service drop above or within 10ft of pool req s clearance of 22 1 /2 ft in any direction from water [4203.6] {T680.8} n Underground <5ft from pool only for supply of pool equipment & only using RMC, IMC or PVC [4203.7] {680.10} n 15A or 20A 120V or 240V pump motor req s GFCI_[ ] {680.22B} n Pool panel feeds RMC, IMC, PVC, LFNC EXC [T4202.1] {680.25A} EMT or existing cable within building OK [T4202.1] {680.25AX} Receptacles n Min 1 recep 6ft & 20ft from pool walls [ ] 94 {680.22A3} 94 n Receps 20ft from pool walls GFCI protected [ ] {680.22A4} Lighting Outlets n Outdoors lights min 5ft from pool or 12ft above [ ] n Indoors 7 1 /2ft above water OK if enclosed & GFCI_[ ] {680.22C1} {680.22C2} Bonding & Grounding n Pool light grounds unspliced except on terminals [4205.2] {680.23F2} n Provide conductive perimeter surface 3ft beyond pool & 4-6in below subgrade for bonding [4204.2] 95 {680.26B2} 95 n Bond together pool shell, perimeter, metal equipment. for pumps, pool covers, underwater light forming shell, & all metal 5ft of pool_[4204.2] 96 {680.26B} 96 n Intentional bond to pool water req d w/ min 9sq.in in contact [4204.3] 97 {680.26C} 97 n Bonding wire min solid 8AWG Cu [4204.2] {680.26B} n Branch circuit EGC min 12AWG [4205.2] {680.23F2} Underwater Lighting n GFCI-protected or low-voltage [4206.4] n Top of light min 18in below water level [ ] n PVC to underwater lights req s 8AWG insulated bonding conductor [ ] n Encapsulate bonding conductor on forming shell [ ] n Segregate GFCI-protected raceways from non-gfci_[4206.3] n Junction box L&L for pool light [ ] n Junction box min 8in above max water [ ] n Junction box min 4ft from pool edge [ ] hot tub/spa If <4 appliances, enter or If 4 appliances, enter subtotal 75% Largest motor if not including AC nameplate 25% Total load Total load 240V = SERVICE AMPS {680.23A3} {680.23A5} {680.23B2} {680.23B2} {680.23F3} {680.24A1} {680.24A2} {680.24A2} n Outdoors same rules as swimming pools [4202.1] {680.42} n Cord 15ft OK for GFCI-protected packaged unit [4202.2] {680.42A2} n Bond all metal within 5ft [4204.2] {680.26B5}v HYDROMASAGE TUBS n Equipment accessible w/o damaging building finish _ [4209.3] {680.73} n Individual branch circuit & GFCI protection req d [4209.1] 98 {680.71} 98 n All receps within 6ft req GFCI protection [4209.1] 99 {680.71} 99 n Metal piping systems & grounded metal parts in contact w/circulating water bonded to motor lug w/ min 8 AWG Cu F82_[4209.4] 100 {680.74} 100 FIG. 82 Hey Kids! Guess what Ben is holding in his other hand? boxes General 09 IRC 08 NEC n Repair wallboard side gaps > 1 /8in to outlet box F83 [3906.6] {314.21} n Outlet box flush w/ combustible surface F83 [3906.5] {314.20} n 1 /4in from non-combustible surface (drywall) F83 [3906.5] {314.20} n Boxes & conduit openings must remain accessible [ ] {314.29} n Min 6in free conductor in box min 3in past face [ ] {300.14} FIG. 83 Bad Box Placement Box setback too deep (>1/4in.) Hydromassage Tubs Box extender (goof ring) Opening cut too large (>1/8in. gap) Box Fill n Box size for conductors, devices, & fittings T29 [ ] {314.16} n Pancake boxes too small to connect inside F84 [ ] {314.16B} n 18cu.in box w/ device too small for 3 12/2 NM cable[ ] {314.16B} Table 29 Box Fill Worksheet [ ] Item Size # Total #14 conductors exiting box 2.00 #12 conductors exiting box 2.25 #10 conductors exiting box 2.50 #8 conductors exiting box 3.00 #6 conductors exiting box 5.00 Largest grounding conductor-count only one 1 Devices: 2 connected conductor size Internal clamps-one based on largest wire present 1 Fixture fittings-one for each type based on largest wire TOTAL FIG. 84 Pancake Boxes Pancake boxes are not suitable for most applications because they are too small for wiring connections. 6cu. in. 4cu. in.