Scaffolds, Boatswain’s Chairs and Related Equipment

21.  (1)  The erection, alteration or dismantling of a scaffold shall be carried out under the supervision of a competent person.

(2)  Work shall not be carried out on or under a scaffold or working platform that is being erected, altered or dismantled unless it is carried out from a part of the scaffold or working platform that complies with the requirements of sections 22 to 31.  R.R.O. 1990, Reg. 859, s. 21.


22.  
(1)  Every scaffold,

(a)   shall be capable of supporting at least,

(i)   two times the maximum load to which it is likely to be subjected without exceeding the allowable unit stresses for the materials of which it is constructed, and

(ii)   four times the maximum load to which it is likely to be subjected without overturning;

(b)   shall not be loaded in excess of the maximum load it can reasonably be expected to support and in any event shall not be loaded in excess of the maximum load described in clause (a);

(c)   shall be constructed of suitable structural materials;

(d)   shall have horizontal members that prevent lateral movement and that do not have splices between the points of support;

(e)   shall have footings, sills or supports that are sound, rigid and capable of supporting without unreasonable settlement or deformation at least two times the maximum load to which the scaffold is likely to be subjected;

(f)   if it consists of a structural system of tubular metal frames, shall have connecting devices between components that provide positive engagement in compression and tension;

(g)   shall have all fittings, gears, base plates and wheels installed according to manufacturer’s instructions;

(h)   shall have safety catches on all hooks; and

(i)   shall be adequately secured at vertical intervals not exceeding three times the least lateral dimension of the scaffold, measured at the base in order to prevent lateral movement of the scaffold.

(2)  Clauses (1) (d) to (i) do not apply in respect of a suspended scaffold.

(3)  A scaffold that exceeds fifteen metres in height above its base support, and a scaffold constructed of a tube and clamp system that exceeds ten metres in height above its base support shall be designed by a professional engineer and erected in accordance with the design.  R.R.O. 1990, Reg. 859, s. 22.


23.  
Every scaffold mounted on castors or wheels,

(a)   shall have a height which does not exceed three times the smallest lateral dimension of the scaffold when it is measured at the base, or measured between the outriggers;

(b)   shall be equipped with a suitable braking device on each castor or wheel; and

(c)   shall have the brakes engaged when a worker is on the scaffold or the scaffold is unattended. R.R.O. 1990, Reg. 859, s. 23.


24.  
The working platform of a scaffold,

(a)   shall be designed, constructed and maintained to support all loads to which it may be subjected without exceeding the allowable unit stresses for the materials of which it is constructed, and in any event shall support not less than 2.4 kilonewtons per square metre;

(b)   shall be at least 460 millimetres wide;

(c)   shall be provided with a guardrail at each open side and at the end of the platform;

(d)   if the platform consists of sawn lumber planks, shall have planks of Number 1 grade spruce that,

(i)   bear a legible grade identification stamp or bear a permanent grade identification mark,

(ii)   are at least forty-eight millimetres thick by 250 millimetres wide with a span not exceeding 2.1 metres,

(iii)   overhang their supports by not less than 150 millimetres and not more than 300 millimetres, and

(iv)   are cleated or otherwise secured against slipping; and

(e)   if the platform consists of planks manufactured of laminated wood, metal or a combination of materials, shall consist of planks tested in accordance with good engineering practice to demonstrate their structural equivalence to the sawn lumber planks specified in clause (d).  R.R.O. 1990, Reg. 859, s. 24.


25.  
Sections 26 to 30 apply in respect of every,

(a)   suspended scaffold that is permanently installed on a building or structure;

(b)   suspended scaffold that is transported in component form and is assembled for use at a work site; and

(c)   boatswain’s chair or similar single-point suspension equipment intended for the support of one worker.  R.R.O. 1990, Reg. 859, s. 25.


26.  
All mechanically or electrically operated equipment used in connection with equipment described in section 25,

(a)   shall be suitable for the purpose for which it is used;

(b)   shall have legible operating and maintenance instructions of the manufacturer affixed to the equipment;

(c)   shall be operated, inspected and maintained in accordance with the manufacturer’s instructions;

(d)   shall not be used in a manner which endangers a worker; and

(e)   shall not be used when a component which may affect its safe operation is defective or damaged.  R.R.O. 1990, Reg. 859, s. 26.


27.  
(1)  Every primary suspension line and lifeline used in connection with equipment described in section 25,

(a)   shall be rigged in accordance with generally accepted rigging practice;

(b)   shall be rigged so that each line hangs vertically from the roof or access level to the ground or level of egress of a worker using the line;

(c)   shall have a breaking strength of at least ten times the static load that the line is intended to support;

(d)   shall have each connecting end wrapped around a protective thimble and securely fastened,

(i)   by means of a swagged fitting or eye splice, if applied by the manufacturer of the line, or

(ii)   if the line is a wire rope, by a minimum of three clamps;

(e)   shall be inspected before each day’s use by a competent person who shall report any defects or damage to a supervisor; and

(f)   shall not be used when defective or damaged.

(2)  Every primary suspension line for a boatswain’s chair or similar single-point suspension equipment that is made of organic or polymer fibres,

(a)   shall be doubled from the anchor point or point of suspension of the line to the ground or egress level;

(b)   shall be permanently marked with,

(i)   the name of the manufacturer,

(ii)   the date of manufacture of the line, and

(iii)   the length of the line;

(c)   shall be protected from abrasion;

(d)   shall be used only with a descent control or similar device;

(e)   shall be tested by a recognized testing laboratory twenty-four months from the date of manufacture of the line and once every twelve months thereafter for compliance with clause (1) (c); and

(f)   shall be discarded,

(i)   where it is found not to comply with clause (1) (c),

(ii)   in accordance with the manufacturer’s recommendations, or

(iii)   when it is no longer safe for use,

whichever occurs first.

(3)  Every descent control or similar device referred to in clause (2) (d),

(a)   shall be approved by the manufacturer of the device for window cleaning; and

(b)   shall be used in accordance with the installation, operating and maintenance instructions of the manufacturer, which instructions shall be kept available for the inspection of an inspector.  R.R.O. 1990, Reg. 859, s. 27.


28.  
Every boatswain’s chair,

(a)   shall have a seat at least 600 millimetres long and 250 millimetres wide of one piece construction capable of supporting 225 kilograms;

(b)   shall be supported by a sling constructed of wire rope of at least nine millimetres that crosses underneath the seat;

(c)   shall not be used where the descent exceeds ninety metres;

(d)   shall only be used to clean windows within arm’s reach of a worker who is freely suspended on the primary support line; and

(e)   shall not be used when a worker is using corrosive substances or solutions for window cleaning.  R.R.O. 1990, Reg. 859, s. 28.


29.  
(1)  Every static or horizontal line that is rigged between anchor points and to which lifelines or primary support lines are directly attached shall be used as a professional engineer directs, and the professional engineer shall certify the maximum load to be applied to the static or horizontal line.

(2)  The support capability of an anchor point shall exceed the total breaking strength of all support lines attached to it.  R.R.O. 1990, Reg. 859, s. 29.


30.  
(1)  Every outrigger beam, cornice hook and parapet wall hook that is used to support a primary support line,

(a)   shall be capable of supporting at least four times the maximum load to which it may be subjected,

(i)   without overturning, and

(ii)   without exceeding the allowable unit stress for the materials of which it is constructed;

(b)   shall be constructed of steel, aluminum or equivalent material; and

(c)   shall be tied back to a fixed support so as to prevent movement of the outrigger beam, cornice hook or parapet wall hook.

(2)  Every outrigger beam that is used to support a primary support line,

(a)   shall have counterweights that are manufactured for the purpose, marked to indicate their weight and securely attached to the outrigger beam;

(b)   shall be accompanied by the supplier’s or manufacturer’s instructions indicating the number of counterweights necessary for each arrangement of the beam that may be employed for window cleaning and the load that the beam can bear for each arrangement; and

(c)   if it is positioned on a rolling undercarriage, shall have the undercarriage fixed to prevent the counterweights from moving while a worker is suspended by the primary support line.  R.R.O. 1990, Reg. 859, s. 30.


31.  
(1)  Every worker on a suspended scaffold, boatswain’s chair or similar single-point suspension equipment shall have an effective means of summoning assistance in case of emergency.

(2)  Every worker who is on, or is in the process of getting on or off a suspended scaffold or boatswain’s chair or similar single-point suspension equipment shall be protected by a fall arrest system.  R.R.O. 1990, Reg. 859, s. 31.