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NSTM 300 Rev 8 Part I
Overview
ELECTRIC PLANT GENERAL
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BACKGROUND
 NSTM 300 was completely re-written to clarify and
update requirements for today’s increasingly complex
shipboard electrical systems.
 The enclosed training introduces the Fleet to major
changes regarding electrical safety and arc flash
protection, but is not intended to replace more
detailed electrical safety training.
NSTM 300 Part I
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BACKGROUND
 In 2009, a team including COMNAVAIRFOR,
COMNAVSURFOR, COMNAVSUBFOR, NAVSEA,
Navy Shipyards, Naval Safety Center, and the Fleet
were tasked with this re-write. Local instructions
(SSORM, CNAF Nuc Notes, standing orders, ect.), as
well as civilian requirements (National Fire Protection
Association 70E, OSHA standards, NIOSH standards,
etc.) were used and adhered to as much as
operationally possible in a military environment
during this effort.
NSTM 300 Part I
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NSTM 300 LAYOUT
 Section 1: Sources of Information
 Section 2: Electrical Safety Precautions
 Section 3: Electrical Insulation
 Section 4: Maintenance of Electrical Equipment
 Section 5: Recondition of Electrical Equipment After
Contamination by Seawater, Lithium Bromide, Oil,
Carbon Dust or Combination of these Materials
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NSTM 300 LAYOUT
 App A: Electrical Insulating Materials
 App B: Certification Procedure for Providing Motors
with a Sealed Insulation System
 App C: Certification Procedures for Refurbishment of
Submarine Ship Service/400 Hz Motor-Generator Sets
 App D: Banding Armatures with Resin-Treated
Fibrous-Glass Banding Tape
 App E: Trickle Method of Shipboard Motor Repair
NSTM 300 Part I
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NSTM 300 LAYOUT
 App F: Quality Assurance Inspection Procedures and
Information for Application of Insulating Varnishes to
Navy Electrical Equipment
 App G: Safety Supplement
 App H: Electrical/Electronic Workbenches
 App I: Safety Equipment
 App J: Technical Manual Deficiency/Evaluation
Report (TMDER)
NSTM 300 Part I
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REV 8 Training
 Not meant to be electrical safety training, but instead
covers changes to electrical Saftey requirements
presented in Rev 8
 Includes new definitions included in Rev 8
 Introduces tables to assist
operators included in Rev 8
 Clarifies requirements
included in Rev 8
NSTM 300 Part I
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REV 8 Training
 The training is comprised of seven parts:
 1: Overview
 2: Electric shock and arc flash (Sec 2.1 & 2.2)
 3: Electrical work and energized work (Sec 2.3 & 2.4)
 4: Initial voltage verification (Sec 2.5.1 & 2.5.2)
 5: Fuse removal and replacement (Sec 2.5.3)
 6: Circuit breaker removal and replacement (Sec 2.5.4)
 7: Visual inspections, damaged/inoperative gear, < 30
volt control, covered/wetted gear (Sec 2.5.5 & 2.5.6)
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VOLTAGE CATEGORIES
 All voltages in these presentations are alternating
current (AC) root mean square (RMS) or as direct
current (DC) unless otherwise specified
 Rev 8 establishes voltage control categories:
 ≤ 30 volts
 >30 volts to < 1000 volts
 ≥ 1000 volts
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PART II
 Clarifies and updates electrical safety requirements
 Introduces:
 Arc flash
 Arc blast
 Flash protection boundary
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PART III
 Defines electrical work
 Discusses requirements for a
qualified electrical worker
 Breaks down energized work requirements based on
different voltages
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PART IV
 Discusses initial voltage verification
 Introduces risk categories
 Defines stray voltage and how to eliminate it
 PPE requirements based on
Table 300-2-1b
 How to verify meter operability
 Defines safe to work checks
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PART V
 Provides guidance for removing/installing fuses
 PPE for fuse removal/installation
based on TABLE 300-2-2
 Introduces the different categories of fuse
removal/replacement depending on fuse panel type
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PART VI
 Defines two basic types of circuit breakers, fixed
mounted and draw-out type
 Discusses the different positions of a draw-out type
circuit breakers
 PPE based on TABLE 300-2-3 depending on the status
of the circuit breaker energization
 Provide guidance for racking circuit breakers
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PART VII
 Provide guidance for performing visual inspection of
energized equipment
 Discusses adequately covered energized components
 ≤ 30 volt controls
 Damaged and inoperative gear
 Wetted equipment
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SUMMARY
 Training is provided to assist the crew in training on
NSTM Chapter 300, Revision 8; it is not intended to
replace electrical safety training
 Introduces new definitions, requirements, voltages
categories and tables.
NSTM 300 Part I
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