assembly drawings and where conflicts arise, the released engineering drawings
take precedence.

Introduction
The utmost concern, while working with High Voltage (HV) systems, is the safety of yourself,
other personnel and the potential of damage to property. To minimize these risks, it is crucial
to be properly trained and always maintain a very alert, questioning and disciplined attitude
without fail. As soon as your guard is lowered, then the potential of an accident is probable
that can hurt or kill yourself or someone else and possibly damage property.
What is High Voltage (HV)?

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Any form of voltage that is greater than 50 volts if the person’s skin at the electrical contact
points is not compromised and not wet.
Equipment Required
The following equipment shall be required:
Digital Multimeter (DMM), 1000 volt Category III, 600 volt Category IV,
10Megohm impedance or greater with insulated case or rubber holster
Clamp-on current probe, 1000 volt Category III, 600 volt Category IV
High Pot Tester (Hi-Pot)
Phase rotation meter
Personal Protection Equipment (PPE) appropriate for 700volt DC & 230
volt AC with Class 00 or higher HV gloves with compatible leather over
gloves. Appropriate safety glasses as well as the face shield. The PPE
shall also meet the required Arc Flash & Arc Blast requirements. Before
use, inspect the PPE in accordance with this guideline.
Adequate lighting
HV insulated mat
Two fused HV clip leads 10 inches long
Safety barricade with warning lights & "Danger High Voltage" signs
Belt tool pouch (use only to carry small components up/down a ladder)
Torque Screwdriver set
Imperial torque nut driver set
Metric torque nut driver set
Imperial 1/4" torque drive socket set
Imperial 3/8" torque drive socket set
Insulated rescue hook
ABC Fire extinguisher, 5 lb minimum, at the activity areas
Spare HV and low voltage fuses
Equipment Calibration
All test equipment must be within their calibration interval and recorded such with the
respective serial numbers. These records must be available to the Checker.
Personnel Requirement
Only trained personnel shall supervise and perform High Voltage system testing, checkout and
troubleshooting. Two personnel (one called the Checker & the other called Monitor/Recorder)
shall perform Checkout Procedures, together, to ensure safety of themselves, others nearby &
for the protection of vehicle & property. Refresher training shall be provided to these
personnel on a regular basis and when new systems are to be checked by them. The training
of the personnel shall consist of:

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HV & low voltage basics, intermediate & advanced electricity
HV & low voltage electrical systems of the vehicle
Shop safety practices & procedures
First aide including CPR & the use of the shop defibrillator
How to release a victim that can’t let go HV
Quickest method of shutting down HV
Fire fighting and emergency procedures
HV & arcflash safety
Organized & tidy placement of equipment & tools allowing for
unrestricted movement
Operation of Hi-pot
Operation of Phase Rotation Meter
To ensure effectiveness of training, exams of the trained material shall be required with a high
passing mark of at least 80% and a retraining of the missed 20 % on a one to one basis.
Checker Function
(Caution: The Checker must not have any health conditions that can be exacerbated when
startled and must not have any electronic implants.)
Directed by the Monitor/Recorder
Performs all preparations & checks
Wears PPE as specified by the Checkout Procedure
Performs all restorations
Vehicle Inspection
It is necessary that the vehicle to be checked out, first be visually inspected of all systems,
workmanship and with special attention to ensuring there is no HV cable or equipment damage
or chafing.
High Voltage Checkout Preparation
(1) The scope of the work must be accurately defined such as a Checkout Procedure that
requires systematic steps with sign offs. Before a Checkout is performed, the
Supervisor, Checker and Monitor/Recorder must conduct a briefing of what shall
transpire, identify potential hazards, resist pressures of “is it done yet?”, anticipate
problems and question possible events. If an unexpected electrical hazard or fault
occurs, during any time of the Checkout, it must be immediately reported to the
supervisor. After the Checkout is completed the same group should review the results
and processes and make proposed modifications to the procedures if required.

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(2) Install Safety barricade with warning lights & signs indicating "Danger High Voltage"
around the vehicle perimeter and ensure no personnel are within the fenced perimeter
during the checkout procedure.
(3) It shall always be the goal to check the systems as much as possible with all HV power
OFF and Locked Out/Tagged Out and proven as de-energized by voltage measurement
using the DMM. The functionality of the DMM must be proved before and after the
verification of no HV present. Then, if possible, the HV systems should be challenged
by trying to energize them while checking that no HV appears.
(4) When it is necessary to perform tests of HV systems with the power ON, then the
Working Live procedure must be followed.
(5) The test personnel shall always rehearse the actions required in case of any possible
accident scenarios.
(6) Before beginning the Checkout Procedure, the test personnel shall remove all their
jewelry (including pierced ones), watches and any electrically conductive objects on
them.
PPE Requirements
The PPE voltage class, Arc Flash and Arc Blast rating shall be compatible with the voltage and
Arc Flash capability of the systems being tested. Appropriate leather glove protectors shall be
worn over the HV rubber gloves.
PPE Care & Testing
Rubber insulated PPE shall be periodically cleaned and tested in accordance with 29 CFR
1910.137 and the appropriate ANSI/ASTM standards. HV gloves, sleeves and mats shall be
tested every 6 months. PPE apparel shall be cleaned and maintained in accordance with the
manufacturer’s instructions. A record of the PPE testing shall be maintained and available to
the users.
PPE Inspection
Inspect PPE equipment, before use, for any degradation or damage and ensure that the HV
gloves have been tested every 6 months. Also perform an air pressure test on the HV gloves
before and after each use. If during PPE use a potential damaging incident occurred to the
PPE, stop further testing and inspect the PPE. If at any time the PPE is defective, reject it, and
obtain an accepted one.
PPE Storage
PPE apparel should be stored lying flat, undistorted, right-side out and not folded in protective
containers. The HV mats can be rolled with an inside diameter greater than 2 inches.
Rubber HV gloves should be stored in cool, dark, dry, and free from damaging chemicals or
vapors. The glove cuffs should face downwards, without folding, in the appropriate glove bag
and hung vertically.
Insulated Tools

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Insulated tools should be visually inspected for insulation damage before and after each
session of use.
Lockout/Tagout Procedure
The Lockout/Tagout procedure should be followed that is specified in the respective Checkout
procedure. When removing the lock and tag:
(1) The locks and tags shall be removed by the installer of them or under her/his
supervision.
(2) If the installer of the locks and tags is not available, then her/his supervisor:
(a) Ensures that the installer of the locks and tags in not in the facility
(b) Contacts the installer to inform her/him that the locks and tags will be removed
(c) Reminds the installer of the lock and tag removal when she/he resumes work

Stored Energy
Personnel must always remember the characteristics of stored energy devices such as
capacitors and batteries and when energy is available from.
Working Live
To maximize safety, it is always important to perform the maximum amount of HV checkout in
the de-energized state.
When it is necessary to work with HV equipment while energized or to verify whether HV is
present, the utmost care and safety procedures must be utilized including:
(1) Wearing appropriate PPE with protector gloves over top of the HV rubber gloves
(2) Ensure all personnel, except the Checker and Monitor/Recorder, are clear of the vehicle
(3) Kneeling or standing on HV insulated mat
Energizing & De-energizing Procedure
It is critical that before any HV system is energized that a visual check be performed to ensure
that all possible HV compartments are closed and there is no debris, tools or test equipment
lying on HV terminations. If there is a certain sequence of energizing and de-energizing the
HV system, then all personnel involved must be trained in this sequence. (CAUTION: Never
try to connect or disconnect circuit components such as cables, fuses, connectors, etc while
there is current flowing in the circuit.)
Electrical Injuries
Electrical injuries should be immediately reported to the first aide personnel and the
supervisor. Other than electrostatic shocks, even non-injurious electrical shocks should be
reported to the supervisor. These should be immediately investigated and documented to
determine the cause and prevent the occurrence in the future.

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Appendix B – NFIL PPE Categories

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LABOUR ESTIMATE
Item
1

Operation
R & R The Secondary DC Charge Rail Box Cover

Men

Hours

Labor Time
M X HR

1

2.5

2.5

PARTS REQUIRED
Item

Part Number

1

827847

Bracket Protective, DC CNTR Box

Qty.
per
Coach
1

2

34S04010

Screw ¼-20 x 5/8

4

EA

3

50W04000

Washer Flat ¼

20

EA

4

840641

Bracket Charge Box Cover

1

EA

5

081034

Loctite 243 Med

0.010

EA

6

840666

Tall Bracket DC Charge Box Cover

1

EA

7

840713

Short Bracket DC Charge Box Cover

1

EA

8

14S04010

Screw ¼ x 5/8

4

EA

9

736408

Rivnut, ¼” – 20 UNC x 0.27/.125

4

EA

10

5928660

Never Seize

1.010

NA

11

853966

Bracket Protection

1

EA

12

840891

Bracket Protection

1

EA

13

50N04000

Hex Nut SST ¼-20 Nut

6

EA

14

047925

Bulb Seal

2.5

FT

15

840558

Secondary Cover

1

EA

16

20B04010

Bolt Hex, ¼-20 x 5/8”

6

EA

Description

Units

Notes

EA

NA

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