O&M Manuals for Main Contractors
M&E Technical Authoring

What are residual hazards?

What are Residual Hazard that should be included in the Handover Health and Safety manual and O&M manuals?

Since CDM 2007 there has been an increasing emphasis on providing a residual risks section in the health and safety Manual.  Some sub-contractors find this particularly confusing because of the apparent similarity with the risk assessment that they are required to make before they start work.

The residual risks in an O&M Manual relate only to those risks that exist for the client once the Sub-Contractor has left the job.  So, for example, if there is an installation in a high ceiling and it may require some maintenance (eg changing a light bulb), the residual risk is 'working at height' and the advice section will stipulate that appropriate as careful doing be used.

Below is an example of a residual risk assessment:-

Architectural

Residual Hazard

Location

Comment

Working at Height

Glass Panels in Facade

The 22no replacement units installed must be cleaned by trained operatives using the cherry picker access parked at Concourse level or the house cradle once it is commissioned.
Please refer to Glazing Section in Architectural File, Section 5.10 for Method Statement and Risk Assessments

Glass Breakages

Bowl side Glazing

In the event that the glass may break it is highly probable it has been caused by means of a collision with elements beyond our control.
It is recommended immediately upon discovering broken glass that the client cordons the area off and contacts a reputable glazing contractor
Be sure to have the area surrounding the shattered glazing thoroughly swept to ensure left free from any failing glass debris.
Click to view Method Statement for the Removal of Glazing Panels.

Falls from Height

Decorating Walls and Ceilings

Advise use of mobile tower/safe working platform when carrying out painting.

Mechanical

Residual Hazard

Location

Comment

Working at Height

Fan Coil Units

Some fan coils particularly associated with the inner bowl area are located in excess of 4m above the finished floor level.  This was unavoidable due to the existing structure of the stadium and the need to distribute the services in the limited space below the main steel works.  It has been proven that all the FCU's are accessible via one man mobile elevated working platform.

Electric Shock

Fan Coil Units & Extract Fans

The fit out has a number of items of plant supply and extract fans in the air handling unit, fan coil units toilet and kitchen extract fans etc. 
All items of plant and equipment must be isolated from all electrical supply prior to being worked on.

Electrical

Residual Hazard

Location

Comment

Working at Height

Ceiling Lighting

ABC Lighting & XYZ Lighting.
Advise use of mobile tower/safe working platform when carrying out maintenance.

Toxic Substances

Ceiling Lighting

ABC Lighting & XYZ Lighting.
Above lamps contain toxic substances and must be disposed of in accordance with Manufacturers COSHH instructions see Electrical O&M section 5.10.

Confined Spaces

Riser cupboards

Apply for suitable permit to work system for entry and undertaking maintenance works.
Inspection or maintenance to be carried out by suitably competent and qualified person.

Toxic Substances

Ceiling Mounted Exit Sign

LMN Lighting
The above lamps contain toxic materials, lamps should be disposed of, intact or broken down utilising an approved method.  We would recommend the disposal of lamps be carried out by a specialist company who would normally provide a safe box for the lamps to be placed in and then take the box away.

Electric Shock

Bus Bars & Tap-Off Units

This Equipment Operates at 400v, 3 Phase.
Inspection or maintenance to be carried out by suitably competent and qualified person.
Ensure complete electrical isolation, verification and lock off of supply device in accordance with isolation procedures for the particular installation prior to carrying out any installation, inspection or maintenance.

Electric Shock

Auto Meters

Inspection or maintenance to be carried out by suitably competent and qualified person.
When removing a meter from the supply it is essential that the meter is fully isolated from the mains, both voltage and current circuits must be isolated.


There are occasions in which the somewhat trivial example shown above will not be adequate.  Perhaps when a particular complex or dangerous piece of equipment has been installed, mostly the advice will be two not touch it there and to call in specified and qualified maintenance engineers to hand to handle any issues that arise.  However it would be useful to ensure that sufficient technical detail is available in the O&M to enable these tech qualified maintenance engineers to navigate through an unfamiliar system.