1ANSI/IEEE 837-1988, Qualifying Permanent Connections Used in Substation Grounding

Project Name: NortraxSection 26 05 28

Project No: 13-013GROUNDING- SECONDARY

Page 1

1General

1.1REFERENCES

.1ANSI/IEEE 837-1988, Qualifying Permanent Connections Used in Substation Grounding.

2Products

2.1EQUIPMENT

.1Clamps for grounding of conductor: size as indicated as required to electrically conductive underground water pipe.

.2Copper conductor: minimum 6 m long for each concrete encased electrode, bare, stranded, tinned, soft annealed, size as indicated.

.3Rod electrodes: galvanized steel copper clad steel stainless steel 19 mm dia by 3 m long.

.4Grounding conductors: bare stranded copper, soft annealed, size as indicated.

.5Insulated grounding conductors: green.

.6Non-corroding accessories necessary for grounding system, type, size, material as indicated, including but not necessarily limited to:

.1Grounding and bonding bushings.

.2Protective type clamps.

.3Bolted type conductor connectors.

.4Thermit welded type conductor connectors.

.5Bonding jumpers, straps.

.6Pressure wire connectors.

3Execution

3.1INSTALLATION GENERAL

.1Install complete permanent, continuous grounding system including, electrodes, conductors, connectors, accessories. Where EMT is used, run ground wire in conduit.

.2Install connectors in accordance with manufacturer's instructions.

.3Protect exposed grounding conductors from mechanical injury.

.4Make buried connections, and connections to conductive water main, electrodes, using copper welding by thermit process permanent mechanical connectors or inspectable wrought copper compression connectors to ANSI/IEEE 837.

.5Use mechanical connectors for grounding connections to equipment provided with lugs.

.6Soldered joints not permitted.

.7Install bonding wire for flexible conduit, connected at both one ends to grounding bushing, solderless lug, clamp or cup washer and screw. Neatly cleat bonding wire to exterior of flexible conduit.

.8Install flexible ground straps for bus duct enclosure joints, where such bonding is not inherently provided with equipment.

.9Install separate ground conductor to outdoor lighting standards.

.10Connect building structural steel and metal siding to ground by welding copper to steel.

.11Make grounding connections in radial configuration only, with connections terminating at single grounding point street side of water pipe. Avoid loop connections.

.12Bond single conductor, metallic armoured cables to cabinet at supply end, and provide non-metallic entry plate at load end.

.13Ground secondary service pedestals.

3.2MANHOLES

.1Install conveniently located grounding stud, electrode, size 4/0 stranded copper conductor in each manhole.

.2Install ground rod in each manhole so that top projects through bottom of manhole. Provide with lug to which grounding connection can be made.

3.3ELECTRODES

.1Make ground connections to continuously conductive underground water pipe on street side of water meter.

.2Install water meter shunt.

.3Install concrete encased electrodes in building foundation footings, with terminal connected to grounding network.

.4Install rod and make grounding connections.

.5Bond separate, multiple electrodes together.

.6Use size 2/0 AWG copper conductors for connections to electrodes.

.7Make special provision for installing electrodes that will give acceptable resistance to ground value where rock or sand terrain prevails. Ground as indicated.

3.4SYSTEM AND CIRCUIT GROUNDING

.1Install system and circuit grounding connections to neutral of primary 13.8 kV system, 120/208V system.

3.5EQUIPMENT GROUNDING

.1Install grounding connections to typical equipment included in, but not necessarily limited to following list. Service equipment, transformers, switchgear, duct systems, frames of motors, motor control centres, starters, control panels, building steel work, generators, elevators and escalators, distribution panels, outdoor lighting.

3.6GROUNDING BUS

.1Install copper grounding bus mounted on insulated supports on wall of electrical room.

.2Ground items of electrical equipment in electrical room to ground bus with individual bare stranded copper connections size 2/0 AWG.

3.7COMMUNICATION SYSTEMS

.1Install grounding connections for telephone, sound, fire alarm, intercommunication systems as follows:

.1Telephones: make telephone grounding system in accordance with telephone company's requirements.

.2Sound, fire alarm, intercommunication systems as indicated.

3.8FIELD QUALITY CONTROL

.1Perform tests in accordance with Section 26 05 01 – Common Works Electrical.

.2Perform ground continuity and resistance tests using method appropriate to site conditions and to approval of Engineer Consultant and local authority having jurisdiction over installation.

.3Perform tests before energizing electrical system.

.4Disconnect ground fault indicator during tests.

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