Operations training
High Voltage Standard / V0 - DRAFT 2025-03-24
Human factors are an established science that uses many disciplines (like anatomy, physiology, physics, and biomechanics) to understand how people perform under different circumstances. For the purposes of the GWO HV standard, the term low voltage is used to refer to voltages less than those defined as high voltage. The exact voltage designation varies globally depending on where you work.
Human factors
Low voltage
Note:
IEC defines LV as voltages normally exceeding 50 V AC or 120 V DC but not exceeding 1000 V AC or 1500 V DC between conductors, or 600 V AC or 900 V DC between conductors and earth. According to the ANSI C84.1-2020: low voltage is between 240 to 600 V and medium voltage is 2.4 to 69kV.
From a global perspective, these classifications and ranges change depending on where you work.
Must
For clarity where the word ‘must’ is used in this standard it shall have the same meaning as ‘shall’. A person who is not a Qualified Person and does not have any responsibilities, given that this person generally needs control, instruction, and supervision to carry out assigned working activities.
Ordinary Person
Additionally, a person who can be instructed to apply his personal lockout equipment in accordance with a company specific Lockout-Tagout program, procedures, and rules. Safe System of Work A Safe System of Work (SSOW) is a set of procedures according to which work must be carried out. SSOW are required where hazards cannot be eliminated, and some risk still exists.
The SSOW can include a wide range of elements such risk assessments, permit to work, energy isolations, confined space entry permits, and others. To reduce or eliminate exposure to hazards, they must be strictly followed. For the purposes of the GWO HV standard, Senior Authorised Person (SAP) refers to a professional who will be responsible for the safety of themselves and others in HV areas; they will take steps to ensure HV equipment is safely isolated and safe to work on and is ultimately responsible as a senior figure for overseeing the work of Authorised Persons. The SAP will be responsible to write Switching Schedules / Instructions and to issue safety documents such as high voltage electrical permits to work. Various terms are used in different regions to indicate that a person holds a record of this competence including SAP / HV Operating Authority, and others. A combination of one or more switching devices together with associated control, measuring, signal, protective and regulating equipment etc completely assembled
Senior Authorised Person
Switchgear
Global Wind Organisation / www.globalwindsafety.org
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