6 Electrical Considerations
6.4 Specifications .1 General
6.4.2.3 Power systems
The review period for the short circuit analysis and coordination study should take place in one day and should be eight hours long, and the Contractor must have the engineer who prepared the report available during this review period. For smaller projects, a four hour review session shall be required.
Available short circuit current shall be indicated on the plans at the service point and at all panelboards and switchboards. The characteristics of the first upstream protective device shall be indicated on the one-line diagram. If this device is a fuse, the manufacturer model number and ampacity shall be provided. If a relay is applied, the manufacturer model number and CT setting shall be provided. The one-line diagram shall also indicate the time margin Southern California Edison requires between its own protective device and the Port of Long Beach main overcurrent device at the maximum fault level.
Version 2.0 6-16 1/30/2009 6.4.2.4 Grounding
Copper-clad steel grounding electrodes, each with ¾” diameter and 10 ft length, shall be used for grounding where needed. Where a ground rod is needed, a ground well set flush with the finished surface shall be provided as required by the City of Long Beach Building and Safety Department. Otherwise, the ground rod and the attached grounding conductor may be buried under the finished surface or terminated above the finished surface in accordance with the National Electrical Code. Where multiple ground rods are to be installed, rods shall be placed at least 15 ft from any adjacent rods.
The ground resistance shall be measured by employing the “fall-of-potential” method using the Biddle “Megger Earth Tester” with two electrodes. This method shall be required in the specifications. The specifications shall also require that any grounding system test reports include the soil temperature at the time the test was conducted. The specifications shall require the Contractor to provide a copy of the test reports certified by the testing technician and the Engineer’s representative authorized to witness the test.
7 References
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Version 2.0 7-2 1/30/2009 17. California Building Code (CBC) (2007), California Code of Regulations, Title 24,
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