Hubbell Power Systems C403-3220 Instructions Manual

Instructions

for the preparation

and use of

®

Protective Grounding-Set

Tester

Catalog No. C403-3220 (115/120V)

and PSC4033220003 (230V)

WARNING

!

Select actual work-site values for system-fault current, fault duration and permissible maximum-worker-body

current before attempting to set grounding jumper acceptable limits.

Failure to select actual system-fault current, fault duration and permissible maximum-worker-body current
may result in personal injury or death.

These instructions do not claim to cover all details or variations in equipment, nor to provide for all possible conditions to be met with
concerning installation, operation, or maintenance of this equipment. If further information is desired or if particular problems are

encountered which are not suciently covered in this guide, contact A. B. Chance Company.

NOTE:

Because Hubbell has a policy of continuous product improvement, we reserve the right to change design and specications without notice.
© Copyright 2016 Hubbell Incorporated, 210 N. Allen, Centralia, MO 65240 Printed in USA

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P403-3222 Rev. K 4/18

TABLE OF CONTENTS

FUNCTIONAL DESCRIPTION ...............................................................................................3

FEATURE DESCRIPTION .......................................................................................................3

SELF TEST PROCEDURE .......................................................................................................6

THRESHOLD PROGRAMMING ............................................................................................7

1. Threshold Derivation ................................................................................................7

2. Changing the Threshold ............................................................................................8

TEST SETUP .............................................................................................................................9

GROUND SET TEST PROCEDURE .....................................................................................10

GROUND SET TROUBLESHOOTING WITH PROBES .....................................................11

EXPECTED GROUND SET RESISTANCE ..........................................................................11

ERROR MESSAGES ..............................................................................................................12

APPENDIX A

THEORY OF RESISTANCE THRESHOLD DETERMINATION ............................12

P403-3222 Rev. K 4/18

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FUNCTIONAL DESCRIPTION

The PROTECTIVE GROUNDING SET TESTER uses a 5 volt direct current (dc) source to measure resis­tances in grounding sets. Output current through the grounding set is limited to a maximum of 10 amps by
an internal current limiting resistor. The tester switches the 5 volt power supply on, makes a measurement,
and switches the power off again for a minimum of 500 milliseconds.

The tester uses a 4 wire resistance measurement approach to obtain accurate resistance measurements. The
measurement system is auto ranging to give +/-1% accurate resistance measure from 1 µΩ* to 6.5 Ω.

FEATURE DESCRIPTION

The following list of features are referenced with number 1 - 19, and the location of the feature is shown on

Figure 1.

1. Test Probes

Probes are used in troubleshooting mode to locate high resistance area of the ground set.

2. Instructional Video P403-3223
Shows how to use the Protective Ground Set Tester. The videotape is not a substitute for this Instruc-

tion Manual. Thoroughly read and understand these instructions before using the Tester.

3. Fixed Input Connections
When the ‘INPUT SELECT’ switch is in the xed position. The resistance measurement shown will

be the value of resistance from one xed connection through the ground set to the other xed con­nection.

4. Power Entry Module
Main power switch illuminates when power to the tester is on, and includes the fuse holder

compartment.

5. Preset Resistance Threshold
This number, shown on the display, is the pass/fail resistance threshold used to light the pass or fail

LEDs. There is a different resistance threshold for each cable size. The ‘<’ symbol displayed means
less than. For example, when ‘<3.333’ (mΩ**) is displayed, it means that a ground set resistance
which is less than 3.333 mΩ** will light the pass LED.

6. Measured Ground Set Resistance
When the ‘INPUT SELECT SWITCH’ is in the ‘FIXED’ position. The value shown will be the re-

sistance measured from one xed connection (3) through the ground set to the other xed connection
(3). When the ‘INPUT SELECT SWITCH’ is in the ‘PROBE’ position. The value shown will be the
resistance measured between the probe contact points.

7. Selected Cable Size
Indicates size of cable under test. This must be changed for each new size cable used.

*1 µΩ (1 micro ohm) = 0.000001 ohm
** mΩ (milli ohm) = 0.001ohm

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P403-3222 Rev. K 4/18

8. Continuous Test Switch
When switched to the ‘ON’ position, the ground set tester will continuously make measurements at

the rate of 1 per second. When switched to the ‘OFF’ position, the ground set tester will hold the last
measurement made.

9. Fail LED (Red)
This LED will light whenever the last measurement is greater than the preset resistance threshold. It

will also turn off to indicate a new measurement is being made.

10. Cable Size Switch
Used to select the size of cable to be tested. (#2, 1/0, 2/0, 4/0)

11. Pass LED (Green)
This LED will light whenever the last measurement is less than the preset resistance threshold. It will

also turn off to indicate a new measurement is being made.

12. Power Cord
For connection to AC power supply.

13. Probe Input
When the ‘INPUT SELECT’ switch is in the ‘PROBE’ position, the resistance measurement shown

will be the value of resistance between probe contact points.

14. Input Select Switch
Allows selection of measurement input between the probes or the xed connections to the ground

set.

15. Single Test Switch

Causes the Ground set tester to make a single resistance measurement and hold the value.

16. Attachment Studs
These copper studs are threaded into the xed connection (3), and the ground set clamps can then be

attached to the studs.

17. Elbow adapter
Used to adapt ground set with grounding elbow to threaded xed connection. 15kV elbow adapter

(C403-3449) is available as an option.

18. Grounded Parking Stand Adapter
Used to adapt ground set with grounded parking stand to threaded xed connection. Parking stand

adapter (T403-3159) is available as an option.

19. Self Test Cable
Used for testing the functionality of the Protective Ground Set Tester.

P403-3222 Rev. K 4/18

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Figure 1: Front Panel of Protective Ground Set Tester Showing Feature Location

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P403-3222 Rev. K 4/18

SELF TEST PROCEDURE

The operation of the Protective Ground Set Tester can be veried using the Self Test Cable included with the
tester. It is not designed to test accuracy.

1. Place the tester on a table of convenient height and plug it into an AC outlet, 110 (Cat. No. C403-

3220) or 220 (Cat. No. PSC403-3220003) VAC.

2. Thread the attachment studs into xed connection inputs.

3. Securely connect Self Test Cable to the attachment studs.

4. Turn on the unit. The power switch will illuminate when the power is on.

5. Place the ‘INPUT SELECT’ switch in the ‘FIXED’ position.

6. Place the ‘CONTINUOUS TEST’ switch in the ‘OFF’ position.

7. Press the ‘SINGLE TEST’ switch.

8. The display will show the measured resistance of the self test cable on line 2 of the display. The
resistance measured should be between 3.0 and 7.5 mΩ**. If the measured resistance is outside these
values, retighten the ball studs and check to make sure that the self test cable has good electrical con­nections. After retest, if the measured resistance is still not between 3.0 and 7.5 mΩ**, discontinue
use of the tester. The Self Test Cable is not designed with tight tolerances for accuracy testing.

Note that the thresholds and pass/fail LEDs will function during the self test but do not pertain to the self

test.

**mΩ (milliohm) = 0.001 ohm

P403-3222 Rev. K 4/18

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