Electrical Safety Risk Assessment Page 5
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6Risk Matrix Method
A risk assessment matrix is a simple table that groups risk based on severity and likelihood. It can be used to assess the
need for remedial action, such as the use of PPE for a given task, and to prioritize safety issues.
The following title categories are used to define the risk:
1. Likelihood of Occurrence:
a. Definite – Almost certain of happening.
b. Likely – Can happen at any time.
c. Occasional – Occurs sporadically, from time to time.
d. Seldom – Remote possibility; could happen sometime; most likely will not happen.
e. Unlikely – Rare and exceptional for all practical purposes; can assume it will not happen.
2. Severity of Injury:
a. Catastrophic – Death or permanent total disability (PTD).
b. Critical – Permanent partial disability (PPD) or temporary total disability (TTD) 3-months or longer.
c. Medium – Medical treatment and lost work injury (LWI).
d. Minor – Minor medical treatment possible.
Slight – First
Severity of the injury (consequences)
aid or minor
treatment.
Likelihood of
Slight
Minor
Medium
Critical
Catastrophic
occurrence in
period
2
Cal/cm
< 1.2
> 1.2 to < 8
> 8 to < 40
> 40
Unlikely
L
L
L
M
M
Seldom
L
L
M
M
H
Occasional
L
M
M
H
E
Likely
M
M
H
E
E
Definite
M
H
E
E
E
Figure 2 Risk Assessment Matrix
3. Interpretation of Risk Assessment Matrix:
a. Extreme (E) - Intolerable risk: Do not proceed. Immediately introduce further controls. Detailed action
plan required. Color code red.
b. High (H) - Unsupportable risk: Review and introduce additional controls. Requires senior management
attention. Color code orange.
c. Moderate (M) - Tolerable risk: Incorporates some level of risk that is unlikely to occur. Specific
management responsibility. Consider additional controls. Take remedial action at appropriate time. Color
code yellow.
d. Low (L) - Supportable risk: Monitor and maintain controls in place. Manage by routine. Procedures.
Little or no impact. Color code green.
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