Cable railing, South Seaport New York City (C) Daniel FriedmanBuilding Code Rules & Installation Specifications for Guardrail Cables: Wire Rope Railings

  • CABLE RAILINGS & GUARDRAILS - CONTENTS: What's a cable or wire rope railing? What's the difference between a guardrail and a handrail? Specifications for Installing Cable-Type Guard Railings along Balconies or Stairways. Cable Railing Specifications: railing height, cable diameters, cable spacing, cable support & cable tensioning. Maximum Sphere Passage Rule vs. Cable Type Guardrails & Stair Rails - Importance of Proper Cable Railing Spacing, Tension & Cable Railing Rigidity. The Ladder Effect of Horizontal Cable Railings - climbing children & Safety Issues
  • POST a QUESTION or READ FAQs about Building Code Rules & Installation Specifications for Guardrail Cables: Wire Rope Railings, spacing, tensioning, support, cable diameters, inspection, safety hazards, applications, & code approvals

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Guide to cable railings or wire rope guardrails: This article describes and includes illustrations of cable or wire rope railings or guardrails used along decks, balconies, walkways and stairways. We include definitions of guardrail, a handrailing or stairway handrail, nad other terms that assist in understanding the building code, construction, and safety requirements that wire cable type railings must meet.

We describe the key installation features necessary for cable railings and we explain both the 4-inch sphere rule problem faced by cable railings and the ladder-effect or climbability problem that these systems must also address. Installing a cable railing according to the manufacturer's specifications for spacing, tension, support, and other parameters (described here) improve the safety of cable railings.

Where the presence of children argues against any sort of horizontally-run guard railing member, cable railing manufacturers can provide vertical cable railing designs.

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Building Code & Manufacturer Specifications for Cable (Wire Rope) Used in Stair & Guardrail Installations

What's a Railing? What's the difference between a guardrail and a handrail?

Guardrail unsafe (C) Daniel FriedmanWhile cable "railings" are permitted under some building codes and by local building Inspectors we find that people speak a bit loosely about the definition of "railing" - and "cable railing".

It is important to be clear in our terminology as building codes specify different requirements for handrailings than for guardrailings in terms of construction, height, and graspability. [48][49][50][51][52]

Definition of Guard railings

Properly, questions about cable railings or wire rope rails are asking about a guard rail, a type of safety "fencing" or "railing" used along the outer side of balconies and stairways, not a "hand railing". Below in this article we discuss the installation and safety of cable-type guardrailings.

Our photo at left illustrates a home-made (and unsafe) cable guardrailing around the top of a stairwell opening in a New York home inspected by the author. The cables were visibly slack, incomplete, and the entire assembly so wobbly that it would easily collapse if leaned-on or stumbled-against.

At Guardrails on Balconies & Landings we provide details about all types of guard railings.

Definition of Hand Railings

Wire cable hand railing at the Pyramids, Mexico City, Mexico (C) Daniel FriedmanA handrail is a horizontal or sloping rail intended to be grasped by a person's hand for support when using a stairway and importantly, instinctively grasped in an attempt to arrest a fall.

Our photo (left) illustrates use of a wire cable "hand railing" along steps ascending the Pyramid of the Sun outside Mexico City.

Watch out: A wire rope or wire cable in the typical dimensions used at railings (1/8-inch to 3/8-inch in diameter) is not a graspable handrailing by any of the building code standards because of its small diameter.

1003. Handrail grasp ability. Handrails with a circular cross section shall have an outside diameter of at least 1.25 inches (32 mm) and not greater than 2 inches (51 mm) or shall provide equivalent grasp ability. If the handrail is not circular, it shall have a perimeter dimension of at least 4 inches (102 mm) and not greater than 6.25 inches (159 mm) with a maximum cross-section dimension of 2.25 inches (57 mm). Edges shall have a minimum radius of 0.125 inch (3.2 mm). - 2000 BOCA, ICBO, SBCCI

See HANDRAILS & HANDRAILINGS for details about hand railing building codes, construction, inspection, & safety concerns.

Specifications for Installing Cable-Type Guard Railings along Balconies or Stairways

Cable Railing Specifications: railing height, cable diameters, cable spacing, cable support & cable tensioning

If you take a look at cable "railing" specifications provided by a company that sells components for cable railing construction [such as Atlantis Rail, Keuka Studios, or Wagner Companies, three suppliers of cable railing systems, you'll see that the "railing" is really a guardrail comprised of stainless steel horizontal cables of diameters of 1/8", 5/32", 3/16", and 1/4" depending on the application.

Horizontal cables are stretched tight, 3" o.c. to form a barrier and are supported by a combination of structural posts and intermediate posts spaced 42" o.c. to 48" o.c. depending on the manufacturer's recommendations.

Wire Rope or Cable Guardrail / Railing Height - Balconies & Walkways vs Stairs

The International Residential Code (IRC) requires a minimum 36-inch-high guardrail for all decks, balconies, or screened enclosures more than 30 inches off the ground. [48][49][50][51][52]

The guardrail top height is in most jurisdictions 36" high (or more) in residential applications and 42" high in commercial installations. Along a stairway the railing height is governed by different rules because of the need to grasp the railing during use of the stairs.

Handrails are required on all stairs more than four risers in height. Handrails cannot be less than 30 inches nor more than 42 inches above the nosing of the treads

Maximum Sphere Passage Rule vs. Cable Type Guardrails & Stair Rails - Importance of Proper Cable Railing Spacing, Tension & Cable Railing Rigidity

Unsafe railing in New York City (C) Daniel Friedman Child safe guardrail on a Seattle Ferry (C) Daniel Friedman

For child safety, the balusters or other decorative infill must be spaced less than 4 inches apart (a 4-inch-diameter ball should not pass between the balusters). [48][49][50][51][52]

At above left is an unsafe guardrailing in New York City. In comparison, the guardrailing shown at above right happens to be on a Seattle ferry and resists even active jumping climbing childern. The mesh guardrail infill is small enough that little toes and shoes don't easily climb the rail.

Companies selling cable guardrailings point out that building codes (IBC and IRC) specify that the opening between vertical balusters or between horizontal railings (if the local code official will permit them) must be close enough together that a 4-inch sphere won't pass between them. [45][46][47]

Watch out: For horizontal guardrailing in-fill cables we point out that if the cable can be stretched or is not properly tensioned, the guardrail system may fail this 4-inch sphere test.

Also the largest opening between the bottom-most horizontal cable or guardrail member and an individual stair tread should not pass a 6-inch sphere.

Cable or Wire Rope Spacing & Tension Are Critical for Safe Guardrails

Unsafe railing in New York City (C) Daniel Friedman

Our photo at above left shows an attractive railing with horizontal cables intended to permit a nice view of the Brooklyn NY skyline. We also demonstrate how easily the cables can be separated as well as how attractive this guard railing is to children.

To have a chance of meeting the 4" sphere rule (maximum sphere passage <= 4 3/8") the cables must be installed with adequate tension and rigidity to prevent deflection by climbing or playing children or other forces that might be anticipated.

If the cable spacing is more than 3" o.c.) or the cable horizontal span is too great, if the intermediate posts spaced too far apart (more than 42" of horizontal distance o.c.), or if the cables are not adequately tensioned, the system may fail this safety test. Using a heavier gauge cable (3/16" diameter instead of the minimum 1/8" diameter) can also add rigidity.

The supporting structural posts and intermediate bracing also need to be strong enough to handle the forces created by properly tensioned horizontal cables. Wagner points out that

An incredible amount of tension is generated on an end post when you have ten or more lines, each tensioned at 400 lbs. over a height of 36" to 42". Often designers and fabricators inexperienced in cable railings will not recognize the amount of the tension applied to the posts.

The end result all too often is end posts which will bend considerably as the cables are being tensioned…or with a railing where the cables cannot be properly tensioned without an unacceptable amount of post deflection. The posts to which hardware is mounted must be constructed so that they will not deflect perceptively as the cables are tensioned. [46]

Cable railing tension demonstration (C) Daniel FriedmanAnd where we have seen cable "guardrailings" installed, indeed a graspable and solid top rail was always provided. The top rail also provides a rigid horizontal support that prevents the whole system from collapsing as vertical posts would bend inwards as the horizontal cables are tightened.

Also, regular inspection of the tension and security of the cables is something I'd recommend, particularly in public areas where the system may be subjected to climbers and pushers.

At left we illustrate that these horizontal cables were very resistant to opening, and considerable force was required to cause enough deflection to pass a 4-inch sphere. Notice that a heavier gauge cable diameter was used (3/8"), adding to the cable rail's rigidity.

Atlantis points out that using a cable tensioner such as their RailEasy™ device permits on-site cable cutting to proper length and adjustment to proper tension without risking slack sagging cables due to mis-cuts or mis-measurement. The company also describes the proper order of tightening the tension on the horizontal cables, starting at the center cable and then alternating above and below that point as each cable is tensioned. [45]

The Ladder Effect of Horizontal Cable Railings - Safety Issues

Unsafe railing in New York City (C) Daniel Friedman Climbable horizontal infill of a guard railing (C) Daniel Friedman

Our concern with any horizontally-run guardrail structure is that it is climbable, and also that often we find the cables are loose enough that a child can easily slip between the cables - an installation or maintenance error, not a conceptual error. In our cable guardrail at above left the tension on the guardrail cables was pretty high but a child standing on the cable can often increase the opening size to more than 4-inches.

At above right where in the distance is a nice view of Lake Washington, the horizontal guardrailing members are constructed of metal pipe and do not stretch or deflect, but they are more than 4" apart and as they are horizontal, a child could easily climb the guardrailing at this Seattle home.

The stretch and opening of horizontal guard cables can be minimized by placing intermittent posts at suitable intervals between the supporting posts. Atlantis suggests no horizontal space between posts should be 4 feet on center - a spacing that I usually see has been violated by the installer.

At least some of the cable railing suppliers offer vertical cable railings for installations where a horizontal railing is not approved or not suitable.

In our OPINION, a vertical cable guardrail adequately addresses the climbability question (the ladder effect) and if properly tensioned, might pass the opening spacing requirements.

The Atlantis company's opinion is that because of their small diameter and lack of rigidity, horizontal cables are thin and not easy to climb. [46] Indeed in our photo where kids were tugging on the horizontal cables installed in a cable railing in New York City, the cables appeared rigid enough that there was not much visible deflection.

Our field experience is that children enjoy climbing horizontal cables and other horizontally run guardrailings. Perhaps due to playground practice, it's apparent that kids have little difficulty ascending the cables. OPINION: We do not recommend any type of horizontal guardrail intermediate members that can be climbed in locations where children may be present.

Stairway Lighting requirements (C) Carson Dunlop Associates

Stairway handrail & stair balusters & guard details are in this sketch.

Balusters (vertical posts comprising the barrier in guards and railings)

  • Baluster opening between vertical members (maximum sphere passage <= 4 3/8")
  • Baluster opening in triangular area below guard bottom rail and stair tread (maximum sphere passage <= 6")

Hand-railing heights are given:

  • U.S. handrails for stairs with one side against a wall: 30-38"
  • U.S. handrails at open stairs: 34-38" above the stairs
  • Canadian stair handrails: 32-36" above the stairs
  • Wall clearance: Handrails along a wall must have at least 1.5" of clearance between the inside surface of the rail and the wall surface.
  • Railings should not project into the required width of the stairway by more than 4.5" at or below the handrail height above the stairs.

Sketch above was provided courtesy of Carson Dunlop Associates and is used with permission.

Research on Child Safety vs Cable Guardrails or Stair Railings

Reader Question: are there really safety or security issues for children with cable railings on decks and stairs?

15 August 2015 Barbara said:
Are there any data or feedback on security issues for children with cable railing (deck and staircase)? I am concerned that they might want to climb on the horizontal cables, but not sure if it is a serious issue.


Horizontal cables or any horizontal member in a guardrail are a child hazard as children can and are tempted to climb such a guardrail - a hazard often described as the ladder effect.

The ladder effect hazard at guardrails and stair guards remains a common opinion among safety experts (cited below) and some code officials and home inspectors, regardless of whether or not the railing was approved by local code officials. In our opinion, the aesthetic desire for cable railings and the marketing objectives of vendors may be a factor in the removal of the ladder effect hazard from some building code restrictions on guardrail design and there may be both inadequate fall and injury reporting data as well as conflicting interests between safety and and industry vendors.

For example, Hedge (2007) completed a under the auspices of the National Association of Home Builders' Research Center (NAHBRC) and funded by and prepred for the National Ornamental and Miscellaneous Metals Association (NOMMA), an industrial association that includes vendors of cable railing systems that did not find data which supported the need for additional code language.

Readers concerned only with code violation and "legality" of cable guardrailings should check with their local building code enforcement official. Readers concerned with child safety should also review the safety articles cited below. Istre (2003) makes clear that guardrail openings spaced or capable of being spaced more than 4 inches apart are a significant fall and injury hazard for children.

Typically there are other hazards such as the ability of the cables to be stretched or moves such that the 4-inch safety opening size can be increased so that a child could also pass through the guard. For this reason some builders and code enforcement officials specify a 3 1/4" spacing between horizontal cables rather than the 4-inch rule of thumb used for solid balusters. Other sources we found (Ellis 2011) suggest that cable manufacturers suggest a 3-inch spacing.

Allowable Openings Code Citations pertinent to Cable Railings

  • IRC 2000 a 4" sphere - general; 6" sphere cannot pass through the at triangle formed by riser, tread and bottom rail. Required guards shall not be constructed with horizontal rails or other ornamental pattern that results in a ladder effect.
  • IRC 2001 a 4" sphere - general; 6" sphere - at triangle formed by riser, tread and bottom rail. The Ladder Effect restriction cited in the 2000 IRC was removed.
  • IRC 2003 R312.2 Guard opening limitations. Required guards on open sides of stairways, raised floor areas, balconies and porches shall have intermediate rails or ornamental closures which do not allow passage of a sphere 4 inches (102mm) or more in diameter.

Exceptions to the spacing rules given above:

Triangular openings formed by the riser, tread and bottom rail of a guard at the open side of a stairway should be such that a sphere 6 inches (152 mm) cannot pass through.

Openings for required guards on the sides of stair treads shall not allow a sphere 4 3/8 inches (107mm) to pass through.

  • IBC 2000 4" sphere – general - to a height of 34"; 6" sphere - at triangle formed by riser, tread and bottom rail; 8" sphere from a height of 34" to 42".

Exceptions: 21" sphere for elevated walk for electrical, mechanical and plumbing systems and Group I-3, F, H, or S occupancies, balusters, horizontal intermediate rails or other construction.

  • IBC 2003 3. In areas which are not open to the public within occupancies in Group I-3, F, H or S, balusters, horizontal intermediate rails or other construction shall not permit a sphere with a diameter of 21 inches (533 mm) to pass through any opening.

    In assembly seating areas, guards at the end of aisles where they terminate at a fascia of boxes, balconies and galleries shall have balusters or ornamental patterns such that a 4-inch-diameter (102 mm) sphere cannot pass through any opening up to a height of 26 inches (660 mm). From a height of 26 inches (660 mm) to 42 inches (1067mm) above the adjacent walking surfaces, a sphere 8 inches (203 mm) in diameter shall not pass.

References discussing cable guardrailings, cable railing safety, design, construction & spacing specifications

Note: the deck building citations below are generally quiet or have little to say about child hazards, climbability, and building code compliance for cable railing systems but they do offer good construction practices and discuss cable tension, spacing, post security and strength and similar cable railing design considerations.

  • Ashby, Karen, and Maria Corbo. "Child fall injuries: an overview." Hazard Edition 44 (2000).
  • Culvenor, John F. "Design of Childproof Barriers to Prevent Falls from a Height in Public Places." The Proceeding of the XVI Annual International Occupational Ergonomics and Safety Conference ʹ2002 - Excerpt "Figure 10 shows a cable barrier along the edge of a balcony. These types of barriers are hazardous because they are climbable. In addition, because the cables are flexible, the spacing can be pushed out to a greater size allowing a child can squeeze through. The cables also present an entanglement and choking hazard and because of their small diameter are also much sharper than larger diameter bars. "
  • Ellis, Mark, "Installing Cable Railings, A simple approach to a great upgrade", Professional Deck Builder, November 2011, retrieved 25 Aug 2015, original source: - Excerpt:
    The International Residential Code (IRC) says that a 4-inch sphere cannot pass between the cables; most manufacturers recommend placing the cables every 3 inches - rather than every 4 inches - to ensure that a railing meets that requirement, because no matter how tight the cable is, there will always be some play in the center of the run, and over time the cables will stretch, allowing even more sag. [Note: the IRC cited is referring to solid, non-deflectable vertical balusters installed in stair, deck, ramp or balcony guardrailings - Ed.]
  • Hedge, Alan, PhD, Thomas Kenney, P.E., Phillip Davis, "Review of Fall Safety of Children Between the Ages of 18 Months and 4 Years in Relation to Guards and Climbing in the Build Environment" [PDF], NAHB Research Center, Inc. 400 Prince Georges Boulevard Upper Marlboro, MD 20774, funded by and prepred for the National Ornamental and Miscellaneous Metals Association (NOMMA), December 2007.
    Research shows that climbing plays an important role in the physical, cognitive, and social development of the young child, and that this is encouraged in many situations, such as playgrounds and school gymnasia.

    Research studies of injuries to children are medically oriented and seldom explore any guard design issues. These studies extrapolate from smaller, longitudinal data sets, usually within a hospital or particular location, to give a national estimate of injuries. Such estimates typically are much larger than the percentage of injuries recorded in the latest injury data set.

    Studies of the climbability of different fencing designs have used inconsistent terminology to describe the designs tested, have used adult encouragement of children to climb the fences, and also have provided abundant safety padding to protect against a fall. Such contrived situations do not reflect how behavior might occur in a naturalistic setting.

    Recent fall injury data from the U.S.Consumer Product Safety Commissionon accidents with guards is analyzed. The results indicate that climbing and falls from these assemblies among young children aged 18 months to 4 years account for an estimated 0.032 percent of injuries resulting in emergency room visits in that population.

    [NOTE: the following comment by peer reviewer Kimberly Stone: "Additionally, the 0.032% injury rate for falls from guards stated in the abstract has no meaning initially because it is not reported in a “per population per year” format nor is it placed into context by comparing to other statistics, such as homicides or motor vehicle collision data."

    Results from either the research studies or the injury data are neither specific enough nor consistent enough to constitute a solid basis for building code requirements.
    Children’s safety concerning guards cannot be guaranteed solely by guard design, but must also involve a program of education on when it is appropriate and when it is not appropriate to engage in climbing a structure.

    [NOTE: the following comments were provided by peer reviewer Kimberly Stone:
    "It was stressed that the literature reports fall incidences in localized areas and that these rates are considerably higher than that derived from the NEISS data. Reasons for this are not fully discussed. One possibility is that the research is carried out in areas with high incidences of this, which is certainly true considering that most research is carried out in urban areas with high buildings. I would argue that the NEISS may underestimate the true burden of falls from guards for several reasons. One reason which was stated, is that the coding of the NEISS is not conducive to identifying these falls. Also, since little research has been done on the target area of falling from a guard, the fall rates reported in the literature (mostly stairs and windows), does not reflect the actual incidence of falls from guards. Also, many injuries resulting from falls from guards may be treated in urgent care centers, primary care providers’ offices or not brought to medical attention for a variety of reasons. Even though these falls may be less severe since the victims are not seen in an emergency room or hospital, they may still contribute substantially to the economic burden of injury in medical costs and lost income10.

    The conclusions regarding a lack of data regarding guard design features is certainly appropriate. Emphasis is appropriately placed on the fact that there is no research regarding “guards” as defined in this report. However, attention should be paid to the fact that the age of the child seems to be an important factor, since most falls occur in ages 1 to 4, and the fact that after the age of four it seems that few fencing designs can prevent climbing. Examining the fencing designs deemed “unclimbable” by younger children should certainly provide a starting point for guard design.

    One concern I have is that emphasis is placed on the child climbing over the guard and falling. There was no mention of the possibility of a child attempting to climb a guard and falling while failing to climb it. In the studies conducted regarding climbability of guards, great attention was paid to preventing children from falling during the study and they did not report if falls occurred when children failed to climb the guard. It is certainly possible that falling backward from the guard could cause as much injury as falling over the guard, and this should be considered when designing guards.

    The American Academy of Pediatrics’ policy statement on prevention of falls is appropriately cited when discussing the importance of injury prevention11. There is also an impressive amount of literature in the health education literature regarding health promotion and education, as well as the interaction between legislation and individual and community education. I encourage you to read articles by Andrea Gielen, ScD on this topic. Another report of interest is the report “Built Environment, Healthy Communities, Healthy Homes, Healthy People” which reports on a symposium sponsored by the NIEHS. While it is true that counseling can increase some injury prevention behaviors, the most effective injury prevention strategies are those that involve legislation and passive protection12" - Kimberly E. Stone, MD, MPH, Fellow, American Academy of Pediatrics Member, Section on Injury and Poison Prevention,

  • Istre, Gregory R., Mary A. McCoy, Martha Stowe, Kevin Davies, D. Zane, R. J. Anderson, and R. Wiebe. "Childhood injuries due to falls from apartment balconies and windows." Injury Prevention 9, no. 4 (2003): 349-352. Excerpt:
    Ninety eight children were injured in falls from buildings during the three year period; 39 (40%) were admitted to hospital. Seventy five of the falls (77%) involved apartments, and most occurred around noon or evening meal times. Among apartment falls, 39 (52%) fell from windows, 34 (45%) from balconies, and two (3%) from unknown sites. For more than two thirds of balcony related falls, the child fell from between the balcony rails, all of which were spaced more than 4 inches (10 cm) apart. On-site measurement showed the rails were an average of 7.5 inches (19 cm) apart; all of these apartments were built before 1984. For more than two thirds of window related falls, the window was situated within 2 feet (61 cm) of the floor.
  • Katwijk, Kim, & Linda Katwijk, "Installing Cable Railings - Two specialty tools and a few techniques expand your design options", Professional Deck Builder, March-April 2007, Excerpt:
    Cable railing is much easier to install than many deck builders think. Horizontal cables are run through holes drilled in railing posts and tightened with turnbuckles or studs (connectors that grab the cable and tighten by way of a nut) until they "sing." Open and airy, cable railing virtually disappears, offering the client an unobstructed view and a clean, contemporary look. Stainless steel cable railing is low maintenance, long lasting, and fairly easy to install. With a little know-how, you can turn a nice profit. Cable and Posts Cable comes in 1/8-inch to 1/2-inch diameters, in 1/16-inch increments.
  • Lanigan, John Bartlett. "The Most Complete Incomplete Fall Presentation." In ASSE Professional Development Conference and Exposition. American Society of Safety Engineers, 2003.
  • Lanigan, John Bartlett, and Ruby Clemens. "The When, Where And How to Look For Fall Exposure." In ASSE Professional Development Conference and Exhibition. American Society of Safety Engineers, 2009.
  • Lido Designs, Inc., "Building Codes - general information and guidelines", [in BuyRailings, a division of Lido Designs, Inc.], (2011), retrieved 25 Aug 2015, original source:, Excerpt:
    The published 2000 IRC stated that guardrails shall not be constructed with horizontal members or other ornamental pattern that results in a ladder effect. The ladder effect has never been a part of the IBC. The ladder effect was removed from the IRC during the 2001 code cycle. The change was noted in the 2001 IRC supplement and the current 2003 IRC contains no reference to the ladder effect.
    However, some local code authorities are using older codes based on BOCA – the creator of the ladder effect wording – and the 2000 IRC. Many local code inspectors are not aware of the 2001 change and may reject guardrailings with infills they interpret as creating a ladder effect. It is taking time for the 2001 IRC supplement and the new 2006 model codes to trickle down to the local levels. In the meantime, be prepared to address this issue should it come up in your area.
  • National Ornamental & Miscellaneous Metals Association (NOMMA), 805 South Glynn St., Ste. 127 #311, Fayetteville, GA 30214 Tel: 888-516-8585, Email: "The National Ornamental & Miscellaneous Metals Association was formed in 1958 to serve the ornamental and miscellaneous metals industry. ... NOMMA is strongly committed to improving the industry through education and advocacy work. We are also dedicated to educating owners and the design/build community on the many advantages or ornamental and miscellaneous metalwork. ... Our Mission Statement: The National Ornamental & Miscellaneous Metals Association serves its members and advances the industry through education and the promotion of a positive business environment. Our Purpose: To promote the common business interest of those engaged in the ornamental and miscellaneus metals industry."
  • Peden, M. M. World report on child injury prevention. World Health Organization, 2008.
  • Riley, Joanne E., Michael S. Roys, and Sandra M. Cayless. "Initial assessment of children's ability to climb stair guarding." The journal of the Royal Society for the Promotion of Health 118, no. 6 (1998): 331-337.
    Brown, Ann. "Dear Colleague." Nursing Management 30, no. 1 (1999): 6-7. US CPSC, Publication No. 330, (un-dated),
  • Salas, Tom, "Foolproof Cable Railings - If the posts and rails are properly designed and installed, the cables should never come loose", Professional Deck Builder, June 2015, retrieved 25 Aug 2015, original source: - Excerpt: The most common cable-rail problem I’ve seen occurs when someone tries to convert a conventional balustrade with 4x4 wood posts, 2x6 top rails, and 2x2 pickets to a cable rail by removing the pickets, drilling the posts, and installing a cable kit. Because the compression created by the cables bears on the top rail, the post-to-rail connections, and the outermost posts, the outer posts will bow inward over time from the pull of the cables, even if the posts are well-attached to the framing and meet code. This will lead to an endless cycle of retightening cables and more post bowing. When properly installed, however, wood posts are just as effective as metal posts, and I think no rail is more beautiful than a clear redwood or red cedar post system with cables. I won’t install cable on a 4x4 post, however; the posts must be 6x6 or 4x6, with the long dimension parallel to the cables.
  • Shields, Brenda J., Elizabeth Burkett, and Gary A. Smith. "Epidemiology of balcony fall–related injuries, United States, 1990-2006." The American journal of emergency medicine 29, no. 2 (2011): 174-180.
  • Towner, Elizabeth, and Heather Ward. "Prevention of injuries to children and young people: the way ahead for the UK." Injury prevention 4, no. suppl 1 (1998): S17-S25.


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