EARTH RESISTANCE DET24C

Transcription

1 EARTH DET24C 1 AUTOMATED NUMBER OF TESTS: 1 SERIAL NO. CURRENT A TIME FILTER on/off INSTRUMENT SERIAL NO. TEST NOTES REVISED 9/4/2013

2 INTERSECTING CURVES 2 GENERAL NUMBER OF GROUND RODS INCHES AWG DIAGONAL MEASUREMENT OF GROUND GRID GROUND TESTER MAKE/MODEL GROUND TESTER SERIAL NUMBER LAST CALIBRATION PROBE PLACEMENT DIRECTION DISTANCE FROM C TO O (P) TEST 1 () (P) TEST 2 () (P) TEST 3 () Measurement process is repeated with three different values for D c , 1 OF 3, REVISED 7/15/2010

3 INTERSECTING CURVES FALL OF POTENTIAL CURVE: O TO C = 3 (ohms) FALL OF POTENTIAL CURVE: O TO C = (ohms) FALL OF POTENTIAL CURVE: O TO C = (ohms) 24470, 1 OF 3, REVISED 7/15/2010

4 INTERSECTING CURVES 4 ARBITRARY X DISTANCE 0 TEST 1 TEST 2 TEST 3 D p D p D p VERSUS X DISTANCES (O to C =, and ) (ohms) RESULT: 24470, 1 OF 3, REVISED 7/15/2010

5 SIMPLIFIED FALL OF POTENTIAL 5 GENERAL NUMBER OF GROUND RODS INCHES AWG DIAGONAL MEASUREMENT OF GROUND GRID GROUND TESTER MAKE/MODEL GROUND TESTER SERIAL NUMBER LAST CALIBRATION PROBE PLACEMENT DIRECTION DISTANCE FROM GROUND ELECTRODE TO C IN DESIRED ACCURACY R1 R2 R3 PERCENT OF OVERALL DISTANCE (GROUND ELECTRODE TO P) READING () DEVIATION R avg 0.00 MAX DEVIATION ACCURACY RESULT () RETEST 24420, REVISED 7/7/2010

6 FULL FALL OF POTENTIAL 6 GENERAL NUMBER OF GROUND RODS INCHES AWG DIAGONAL MEASUREMENT OF GROUND GRID GROUND TESTER MAKE/MODEL GROUND TESTER SERIAL NUMBER LAST CALIBRATION PROBE PLACEMENT DIRECTION DISTANCE FROM GROUND ELECTRODE TO C IN EARTH CURVE (GROUND ELECTRODE TO P) PERCENT OF OVERALL DISTANCE READING (Ohms) () DISTANCE FROM GROUND ELECTRODE TO P () RESULT: 24400, REVISED 1/17/2011

7 FALL OF POTENTIAL 61.8 RULE 7 GENERAL NUMBER OF GROUND RODS INCHES AWG DIAGONAL MEASUREMENT OF GROUND GRID GROUND TESTER MAKE/MODEL GROUND TESTER SERIAL NUMBER LAST CALIBRATION PROBE PLACEMENT DIRECTION (GROUND ELECTRODE TO C) PERCENT OF OVERALL DISTANCE (GROUND ELECTRODE TO P) READING () DISTANCE # DISTANCE #2 DISTANCE # , REVISED 7/7/2010

8 SOIL RESISTIVITY 8 GENERAL NUMBER OF GROUND RODS INCHES AWG DIAGONAL MEASUREMENT OF GROUND GRID GROUND TESTER MAKE/MODEL GROUND TESTER SERIAL NUMBER LAST CALIBRATION PROBE PLACEMENT DIRECTION Soil Resistivity (ohm-cm) = 2 * PI * Distance Between Electrodes (cm) * Resistance (ohms) LOCATION IDENTIFIER DISTANCE BETWEEN ELECTRODES (feet) DISTANCE BETWEEN ELECTRODES (cm) ELECTRODE DEPTH (inches) SOIL RESISTIVITY (ohms) (ohm-cm) Measures average soil resistivity at this one point , REVISED 7/7/2010

9 STAR DELTA 9 GENERAL NUMBER OF GROUND RODS INCHES AWG DIAGONAL MEASUREMENT OF GROUND GRID GROUND TESTER SERIAL NUMBER GROUND TESTER MAKE/MODEL LAST CALIBRATION READING () R12 R13 R14 R23 R34 R1 R2 R3 R4 OF THE GROUND ELECTRODE UNDER TEST OF PROBE P2 OF PROBE P3 OF PROBE P4 R42 EQUATION R1 RESULT R2 RESULT R3 RESULT R4 RESULT #1 #2 #3 Resistance Areas # , REVISED 7/7/2010

10 SLOPE METHOD 10 GENERAL NUMBER OF GROUND RODS INCHES AWG DIAGONAL MEASUREMENT OF GROUND GRID GROUND TESTER MAKE/MODEL GROUND TESTER SERIAL NUMBER LAST CALIBRATION PROBE PLACEMENT DIRECTION DISTANCE FROM GROUND ELECTRODE TO C IN Interpolate Result Measure Result "P" PROBE PERCENT OF OVERALL DISTANCE (GROUND ELECTRODE TO P) READING () SLOPE CHANGE /DISTANCE CURVE P T / C R C 0.0 P T / (ft) 0.0 R C 0.0 RESULT (ohms): 0.00 R C , REVISED 7/7/2010

11 FOUR POTENTIAL METHOD 11 GENERAL NUMBER OF GROUND RODS INCHES AWG DIAGONAL MEASUREMENT OF GROUND GRID GROUND TESTER MAKE/MODEL GROUND TESTER SERIAL NUMBER LAST CALIBRATION PROBE PLACEMENT DIRECTION DISTANCE FROM GROUND ELECTRODE TO C IN R1 R2 PERCENT OF OVERALL DISTANCE (GROUND ELECTRODE TO P) GROUND () EQUATION #1 EQUATION #2 EQUATION #3 EQUATION #4 R R R R RESULT RESULT RESULT RESULT R R R R EQUATION #1 (R ) = EQUATION #2 (R ) = EQUATION #3 (R ) = EQUATION #4 (R ) = R R R R R R R R R R R R R R R R , REVISED 7/7/2010

12 GROUNDED SURFACES TEST SINGLE ROOM 12 GROUND REFERENCE ITEM MILLIVOLT READING ITEM MILLIVOLT READING MAXIMUM ALLOWABLE VALUE IS 20 MILLIVOLTS FOR NEW CONSTRUCTION PER THE NATIONAL FIRE PROTECTION ASSOCIATION NFPA-99, 1996, , REVISED 4/22/2009

13 GROUND ROD SURVEY 13 ROD NUMBER LOCATION OR IDENTIFICATION ROD SIZE D X L COPPER CLAD STEEL OR GALVANIZED CONNECTING CONDUCTOR SIZE * * TEST METHOD USED FOR DETERMINING GROUND ROD : 2 POINT 3 POINT CLAMP-ON REFERENCE GROUND 24300, REVISED 4/22/2009

14 GROUND TWO TERMINAL METHOD 14 DRAWING REFERENCE NUMBER FROM TEST # TO UNCORRECTED CORRECTED RESULT MILLI- MILLI- MILLI- MILLI- MILLI- MILLI- MILLI- MILLI- MILLI- MILLI- MILLI- MILLI- MILLI- MILLI- MILLI- MILLI- MILLI- MILLI- MILLI- MILLI- MILLI- MILLI- MILLI- MILLI- MILLI- MILLI- MILLI , REVISED 4/22/2009

15 GROUND MAT TEST 15 NUMBER OF RODS CURRENT TRANSFORMER TYPE: WINDOW: STYLE: BAR TYPE SOLID ROUND SPLIT CORE RECTANGULAR AUXILIARY POTENTIAL ELECTRODE IN 61.8 OF DISTANCE TEST TYPE: FALL OF POTENTIAL TWO-POINT INDUCED FREQUENCY 24020, REVISED 4/22/2009

16 GROUND MAT TEST 16 NUMBER OF RODS CURRENT TRANSFORMER TYPE: WINDOW: STYLE: BAR TYPE SOLID ROUND SPLIT CORE RECTANGULAR AUXILIARY POTENTIAL ELECTRODE IN 61.8 OF DISTANCE TEST TYPE: FALL OF POTENTIAL TWO-POINT INDUCED FREQUENCY 24000, REVISED 4/22/2009

17 LINE ISOLATION MONITOR SYSTEM TEST 17 NAMEPLATE DATA MANUFACTURER MODEL NO. INPUT VOLTAGE CATALOG NO. OUTPUT VOLTAGE SERIAL NO. TYPE ALARM CURRENT PICKUP INDICATOR TESTS DESCRIPTION INSPECTED CONDITION DESCRIPTION INSPECTED CONDITION SAFE LIGHT HAZARD LIGHT PUSH TO TEST PUSH TO TEST SILENCE SELF CALIBRATION METER READING - CIRCUITS ON METER READING - CIRCUITS OFF ma ma VOLTAGE TESTS NO LOAD PRIMARY VOLTAGE H1-GROUND V H1-H2 V H2-GROUND V H2-H3 V H3-GROUND V H3-H1 V X1-GROUND X2-GROUND X3-GROUND NO LOAD SECONDARY VOLTAGE V X1-X2 V V X2-X3 V V X3-X1 V HAZARD LEAKAGE CURRENT TESTS - BRANCH CIRCUITS VOLTAGE TESTS L1-GND L2-GND PANEL LEAKAGE ( µ A) ( µ A) BRANCH CKT. BREAKERS OFF BRANCH CKT. BREAKERS ON (LOADS ARE REMOVED OR OFF) LIM TRIP LEVEL TEST LIM METER READING EXTERNAL METER READING L1-GND (ma) SHADED AREAS FOR 3-PHASE SYSTEMS ONLY L2-GND (ma) L3-GND ( µ A) L3-GND (ma) CIRCUIT NUMBER LEAKAGE LEAKAGE LEAKAGE CURRENT CURRENT CURRENT L1-GND ( µ A) L2-GND ( µ A) L3-GND ( µ A) 26000, REVISED 4/22/2009

18 GROUNDED SURFACES TEST MULTI-ROOM 18 GROUND REFERENCE ITEM MILLIVOLT READING RM RM RM RM RM MAXIMUM ALLOWABLE VALUE IS 20 MILLIVOLTS FOR NEW CONSTRUCTION CRITICAL CARE AREAS, AND 500 MILLIVOLTS FOR GENERAL CARE AREAS PER NFPA-99, 1996, , CRITERIA FOR ACCEPTABILITY , REVISED 4/22/2009

19 GROUND POINT CONTINUITY TEST 19 General Description: Maximum Resistance Test # Description Test Amps A Volts V Calc. Resist. (ohms) Lead Resist. (ohms) Ground Resist. (ohms) Com. Test # Description Test Amps A Volts V Calc. Resist. (ohms) Lead Resist. (ohms) Ground Resist. (ohms) Com , REVISED 11/21/2013

20 FALL OF POTENTIAL TEST 20 NUMBER OF GROUND RODS INCHES AWG DIAGONAL MEASUREMENT OF GROUND GRID GROUND TESTER MAKE/MODEL GROUND TESTER SERIAL NUMBER LAST CALIBRATION POINT UNDER TEST DIRECTION OF ELECTRODES DISTANCE C1 TO C2 DISTANCE P1 TO P2 PERCENT P TO C MEASURED R 40 OHM(S) R 50 OHM(S) R 60 OHM(S) R OHM(S) R OHM(S) RA EQUALS AVERAGED ( R40 R 50 R 60 ) : OHM(S) R 60 MINUS RA DIVIDE BY RA EQUALS X PERCENT X PERCENT TIMES 1.2 EQUALS Y PERCENT IF Y PERCENT IS LESS THAN YOUR DESIRED TEST ACCURACY, RA CAN BE USED AS THE REST RESULT , REVISED 4/22/2009

21 GROUND RESISTIVITY TEST 21 TEST ELECTRODE DEPTH INCHES TEST ELECTRODE SPACING TEST PLOT ID METER READING () CALCULATED RESISTIVITY ( - CM) TEST PLOT ID METER READING () CALCULATED RESISTIVITY ( - CM) TEST PLOT ID METER READING () CALCULATED RESISTIVITY ( - CM) ρ - SOIL RESISTIVITY IN OHM CENTIMETERS RESISTIVITY CALCULATION N: ρ = 2 πα R Α - DISTANCE BETWEEN TEST ELECTRODES IN F R - IN CENTIMETERS = (INCHES) ( 2.54 ) CENTIMETERS = () ( 12 ) ( 2.54 ) 24200, REVISED 4/22/2009