standards and guidelines for communication sites - Radio And ...
standards and guidelines for communication sites - Radio And ... standards and guidelines for communication sites - Radio And ...
CLAMP-ON OHMMETER TESTING PROCEDURE APPENDIX D: GROUNDING (EARTHING) ELECTRODE SYSTEM TESTING/VERIFICATION D.4.2 REQUIRED TEST EQUIPMENT AND SUPPLIES • Clamp-on ohmmeter/ammeter • Insulated electrician's gloves • A photocopy of Table 4-5 on page D-25. This will be needed to record measurements. D.4.3 PREPARATIONS FOR TESTING D.4.3.1 SITE AC POWER DISCONNECT REQUIREMENTS This test does not require disconnection of the site grounding (earthing) electrode system from the power company grounded conductor (may be a neutral wire). The power company grounded conductor is required in order for the meter to display valid reading. However, for a multi-bonded/multi-grounding electrode system it may be necessary to de-energize the site from commercial power if significant unbalanced current flow is present on the grounded conductor. Unbalanced current flow may create noise on the meter, resulting in the inability of the meter to display an accurate reading; the noise condition is typically indicated by the clamp-on ohmmeter. NOTE: A backup generator may be used during the clamp-on ohmmeter test if the communications site requires power. For a site supplied by commercial AC power that contains a neutral wire which is part of an extensive power company grounding system and the site contains a multi-bonded/multi-grounding electrode system, the following steps must be taken first: 1. Coordinate the test with the customer and/or site owner and all other affected parties. 2. Arrange for the site AC power to be turned off and the site switched to a back-up power source if it is available. Any current on the neutral wire (even if less than 5 amps) can result in a false reading. It is therefore recommended that the commercial power be turned off in order to eliminate any currents on the neutral wire that can affect the meter's ability to give an accurate reading. 3. It may be necessary to remove other utility ground connections (such as telephone), depending on their location. This is typically required for a multi-bonded/multi-grounding electrode system. D.4.3.2 CLAMP-ON OHMMETER TEST PROCEDURES CAUTION Follow clamp-on ohmmeter manufacturer's warning and caution information when using tester. Depending on whether site uses a Single Grounding (Earthing) Electrode system or Multi-bonded/ Multi-Grounding Electrode system, proceed to paragraph “Single Grounding (Earthing) Electrode System Testing (or Equivalent)” on page D-15 or “Multi-Bonded/Multi-Grounding (Earthing) Electrode System Testing” on page D-17 as applicable. D-14 68P81089E50-B 9/1/05
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES CLAMP-ON OHMMETER TESTING PROCEDURE D.4.3.3 SINGLE GROUNDING (EARTHING) ELECTRODE SYSTEM TESTING (OR EQUIVALENT) For a site using a single grounding electrode system (or equivalent), perform test as follows: 1. Locate the grounding electrode connection outside of the shelter, or the single wire connecting to the grounding electrode. 2. (See Figure D-7.) Clamp the meter around the grounding electrode connecting wire, making sure that the meter is positioned at a location below any other utility connection (such as the telephone company ground or a water pipe). 3. Set the meter to the Amps scale and check the grounding electrode for current. If 5 amps or more are on the grounding electrode conductor, the test may not be able to be performed due to the design of some meters. If the current on the ground wire is less than 5 amps, a measurement may be taken if the meter does not indicate any noise or other errors. CAUTION Any significant current on the grounding electrode conductor could indicate a serious problem and should be immediately investigated by qualified personnel. 4. Set the meter to the Ohms scale and note the reading; if no noise or other errors are indicated on the meter, this is the resistance of the grounding electrode system under test. Record the reading on the photocopy of the Clamp-on Ohmmeter/Ammeter Test worksheet (page D-25). 68P81089E50-B 9/1/05 D-15
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CLAMP-ON OHMMETER TESTING PROCEDURE APPENDIX D: GROUNDING (EARTHING) ELECTRODE SYSTEM TESTING/VERIFICATION<br />
D.4.2 REQUIRED TEST EQUIPMENT AND SUPPLIES<br />
• Clamp-on ohmmeter/ammeter<br />
• Insulated electrician's gloves<br />
• A photocopy of Table 4-5 on page D-25. This will be needed to record measurements.<br />
D.4.3 PREPARATIONS FOR TESTING<br />
D.4.3.1 SITE AC POWER DISCONNECT REQUIREMENTS<br />
This test does not require disconnection of the site grounding (earthing) electrode system from the<br />
power company grounded conductor (may be a neutral wire). The power company grounded conductor<br />
is required in order <strong>for</strong> the meter to display valid reading. However, <strong>for</strong> a multi-bonded/multi-grounding<br />
electrode system it may be necessary to de-energize the site from commercial power if significant<br />
unbalanced current flow is present on the grounded conductor. Unbalanced current flow may create<br />
noise on the meter, resulting in the inability of the meter to display an accurate reading; the noise<br />
condition is typically indicated by the clamp-on ohmmeter.<br />
NOTE: A backup generator may be used during the clamp-on ohmmeter test if the <strong>communication</strong>s site requires<br />
power.<br />
For a site supplied by commercial AC power that contains a neutral wire which is part of an extensive<br />
power company grounding system <strong>and</strong> the site contains a multi-bonded/multi-grounding electrode<br />
system, the following steps must be taken first:<br />
1. Coordinate the test with the customer <strong>and</strong>/or site owner <strong>and</strong> all other affected parties.<br />
2. Arrange <strong>for</strong> the site AC power to be turned off <strong>and</strong> the site switched to a back-up power source if it<br />
is available. Any current on the neutral wire (even if less than 5 amps) can result in a false reading.<br />
It is there<strong>for</strong>e recommended that the commercial power be turned off in order to eliminate any<br />
currents on the neutral wire that can affect the meter's ability to give an accurate reading.<br />
3. It may be necessary to remove other utility ground connections (such as telephone), depending on<br />
their location. This is typically required <strong>for</strong> a multi-bonded/multi-grounding electrode system.<br />
D.4.3.2 CLAMP-ON OHMMETER TEST PROCEDURES<br />
CAUTION<br />
Follow clamp-on ohmmeter manufacturer's warning <strong>and</strong> caution in<strong>for</strong>mation when<br />
using tester.<br />
Depending on whether site uses a Single Grounding (Earthing) Electrode system or Multi-bonded/<br />
Multi-Grounding Electrode system, proceed to paragraph “Single Grounding (Earthing) Electrode<br />
System Testing (or Equivalent)” on page D-15 or “Multi-Bonded/Multi-Grounding (Earthing) Electrode<br />
System Testing” on page D-17 as applicable.<br />
D-14 68P81089E50-B 9/1/05
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