Electrical Safety in Critical Facilities

Electrical safety for qualified persons in live mission-critical facilities: the 2N critical power chain from 13.8 kV switchgear and 480 V switchboards to UPS systems, batteries, busway and rack power, where shock and arc flash hazards concentrate, the OSH Act, 29 CFR 1910 Subpart S, 1910.137, 1910.147 and 1910.269, the NEC, NFPA 70E-2024 and NFPA 70B-2023, host and contractor duties, qualified persons, switching authority and audits, arc flash studies with multiple configurations and energy-reducing maintenance switching, boundaries in electrical rooms and data halls, electrically safe work conditions in redundant systems with sources tables and absence-of-voltage testers, UPS bypasses, interlocks, backfeed and stored energy, switching orders and peer checks, generators and transfer switches, energized work justification and permits, arc-rated PPE, gloves and meters, condition-based maintenance and thermography, emergency response and a capstone A-side shutdown plan.

HSE-321 12 lessons · 5 h 48 min

Offered by HSM University · Safety Training

This is the American version of this course. See the Canadian version.

What you'll learn

Trace the critical power chain of a data center and identify where shock and arc flash hazards concentrate, including the hazards created by redundancy and rising rack densities.
Map the US requirements for electrical work in critical facilities, including the OSH Act, 29 CFR 1910 Subpart S, 1910.137, 1910.147 and 1910.269, the National Electrical Code, NFPA 70E-2024 and NFPA 70B-2023, and explain host and contract employer duties.
Distinguish qualified from unqualified persons for specific equipment and tasks, assign critical facility roles and apply training, retraining and field audit requirements.
Interpret arc flash studies and labels in multi-source, multi-configuration systems and explain how clearing time and energy-reducing controls affect incident energy.
Apply shock and arc flash boundaries in electrical rooms and data halls, including three-dimensional boundaries, barricade placement and escorted entry.
Establish an electrically safe work condition in redundant systems by identifying every source, isolating it reliably, applying group lockout and testing for absence of voltage on AC and DC parts.
Explain UPS operating modes, bypass interlocks, backfeed and stored energy, and calculate capacitor energy and discharge time.
Prepare and execute switching orders with peer verification and hold points, and control the hazards of switchgear, transfer switches, generators and load bank connections.
Evaluate requests for energized work, separating infeasible from inconvenient tasks, and complete and approve energized electrical work permits.
Select arc-rated clothing, rubber insulating gloves, insulated tools and test instruments for critical facility tasks, and manage shared PPE.
Explain how maintenance affects electrical safety, schedule condition-based maintenance and use infrared thermography and monitoring to find problems without exposure.
Plan emergency response for electrical work and a major maintenance shutdown of one side of a 2N data center, including capacity checks, a complete MOP and backout criteria.

Course content

12 lessons · 5 h 48 min total · final exam

1 The critical power chain and where hazards concentrate 36 min · quiz
2 Law, standards and responsibilities 29 min · quiz
3 Qualified and unqualified persons, training and roles 28 min · quiz
4 Arc flash risk assessment and labels in critical facilities 29 min · quiz
5 Shock and arc flash boundaries 27 min · quiz
6 Establishing an electrically safe work condition in redundant systems 29 min · quiz
7 UPS systems, bypasses and stored energy 28 min · quiz
8 Switchgear, generators, transfer switches and switching procedures 28 min · quiz
9 Energized work: justification and permits 28 min · quiz
10 PPE, arc-rated clothing and tools 28 min · quiz
11 Maintenance, inspection and thermography 28 min · quiz
12 Emergency response and a capstone: planning a major maintenance shutdown 30 min · quiz
E Final exam 20 questions

Requirements

Recommended background. You can start any course at any time.