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Protective Grounding-Set
Catalog No. C403-3220 (115/120V)
and PSC4033220003 (230V)
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 sufficiently 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 specifications without notice.
© Copyright 2016 Hubbell Incorporated, 210 N. Allen, Centralia, MO 65240
Instructions
for the preparation
and use of
Tester
!
WARNING
Page 1 of 20
®
Printed in USA
P403-3222 Rev. K
4/18
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Table of Contents
Related Manuals for Hubbell CHANCE C403-3220
Summary of Contents for Hubbell CHANCE C403-3220
- Page 1 A. B. Chance Company. NOTE: Because Hubbell has a policy of continuous product improvement, we reserve the right to change design and specifications without notice. © Copyright 2016 Hubbell Incorporated, 210 N. Allen, Centralia, MO 65240 Printed in USA P403-3222 Rev.
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Page 2: Table Of Contents
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... -
Page 3: Functional Description
FUNCTIONAL DESCRIPTION The PROTECTIVE GROUNDING SET TESTER uses a 5 volt direct current (dc) source to measure resis- tances 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. - Page 4 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. Fail LED (Red) This LED will light whenever the last measurement is greater than the preset resistance threshold.
- Page 5 Figure 1: Front Panel of Protective Ground Set Tester Showing Feature Location P403-3222 Rev. K 4/18 Page 5 of 20...
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Page 6: Self Test Procedure
SELF TEST PROCEDURE The operation of the Protective Ground Set Tester can be verified using the Self Test Cable included with the tester. It is not designed to test accuracy. Place the tester on a table of convenient height and plug it into an AC outlet, 110 (Cat. No. C403- 3220) or 220 (Cat. -
Page 7: Threshold Programming
THRESHOLD PROGRAMMING Threshold Derivation The resistance threshold (R ) is calculated by dividing the voltage allowed across the man (V by the maximum current (I ) the protective ground set can withstand for the 15 cycles. Table 1 shows the preset values used for four sizes of cable. The ground set tester comes from the factory with (R ) based upon (V ) = 60V which sets the (RTHR) at or below the Pass/Fail Resistance... -
Page 8: Changing The Threshold
Figure 2: Template of Switches When Changing the Threshold Changing the Threshold Turn off the Ground Set Tester. Place the ‘CONTINUOUS TEST’ switch in the ‘OFF’ position. Hold down the ‘CABLE SIZE’ and the ‘SINGLE TEST’ switches simultaneously. Power up the unit. The display should read ‘THRESHOLD CHANGE MODE’. Release the two switches. -
Page 9: Test Setup
TEST SETUP Figure 3 shows the test setup required to test a protective ground set. The protective ground set under test must always be connected between the fixed connection connections regardless of the mode of testing. The ground set carries the test current from one fixed input to the other during testing. Without the ground set, the resulting open circuit prevents the resistance measurement. -
Page 10: Ground Set Test Procedure
GROUND SET TEST PROCEDURE Use the Self Test Procedure to verify operation of the Ground Set Tester before testing Ground Sets. Place the tester on a table of convenient height and plug it into a nominal 120/240V AC outlet. Thread the attachment studs into the fixed connection inputs. Securely connect the Grounding Set to be tested to the attachment studs. -
Page 11: Ground Set Troubleshooting With Probes
GROUND SET TROUBLESHOOTING WITH PROBES The following sections describe how to use the probes in troubleshooting a ground set. Using the probes in this mode, the high resistance areas of the ground set can be identified. Place the tester on a table of convenient height and plug it into a nominal 120/240V AC outlet. Thread the attachment studs into the fixed connection inputs. -
Page 12: Error Messages
ERROR MESSAGES CALIBRATE ERROR The calibration factors have been corrupted. New calibration factors must be generated. Return to factory for repair. COP ERROR Computer Operating Properly Error has occurred. A problem has occurred with the power supply, its connections or an electronics failure. Return to factory for repair. WARNING It is the responsibility of the user to establish and maintain a maximum resistance threshold for the protec- tive ground set to provide a safe working environment. - Page 13 Figure 1 illustrates a parallel protective grounding scheme is used [4], [10], the current flow through the worker is: Fault Current Protective Jumper Current & Current & Resistance Resistance Figure 1 · [R )]Eq. 2 Where: = Current through the man, in amperes = Available fault current at the work site, in amperes = Resistance of the parallel jumper, in ohms = Resistance of the worker, in ohms...
- Page 14 For each multiple increase in current either the maximum calculated protective ground resistance must be divided by the multiple or a new calculation must be made, to reduce the protective resistance accordingly. For multiples of the 1,000 Amp. fault current given above: Fault Current Multiplier Maximum Resistance...
- Page 15 BIBLIOGRAPHY: Dalziel, C.F., THE EFFECTS OF ELECTRIC SHOCK ON MAN, IRE Transactions on Medical Electronics (PHME-5), May 1956 Dalziel, C.F. and Lee, W.R., LETHAL ELECTRIC CURRENTS, IEEE Spectrum, Feb. 1969, pp 44-50 IEEE GUIDE FOR SAFETY IN AC SUBSTATION GROUNDING (ANSI/IEEE Std.
- Page 16 SAMPLE DEVELOPMENT OF CHART WARNING The following is only for illustrative purposes. Actual fault current, fault duration and permissible maxi- mum worker current MUST be determined for the specific power system on which the grounding sets are to be used. Failure to select actual system fault currents, fault durations and permissible maximum worker current may result in personal injury and death.
- Page 17 Chart 1 Chart 2 | The Maximum Voltage across the man will be limited to 100V AC if the maximum 99.5% of Workers Will Not Experience Heart jumper resistance is limited to the value Fibrillation At Currents & Durations Below: | associated with the selected maximum (Based Upon C.F.
- Page 18 Maximum Protective Ground Resistance (From Dalziel's Equation) Time (cycles) Graph 1 This chart is based upon C.F. Dalziel's research and widely used industry values. Calculations were made using equation 1 with the variable being time duration of current flow. P403-3222 Rev. K 4/18 Page 18 of 20...
- Page 19 Maximum Protective Ground Resistance Vman = 100 V. Max. Fault Current (Amps) Graph 2 This chart represents the maximum allowable resistance of the protective ground, based upon the constraint that the maximum voltage drop across the man will never exceed 100 volts, at any fault current level. Equations 3 & 4 were used, the variable was the fault current level.
- Page 20 ® Hubbell / Chance, USA 210 N. Allen Street Centralia, Mo. 65240-1395 573-682-5521 Fax: 573-682-8475 © Copyright 2016 Hubbell Incorporated, 210 N. Allen, Centralia, MO 65240 Printed in USA P403-3222 Rev. K 4/18 Page 20 of 20...
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