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Grounding the Chassis

 

Frame-Grounding a BTI7814 Chassis

The BTI7814 uses DC-I grounding configuration with the return ground isolated from the frame ground.

Warning

You must complete this procedure before connecting power and powering on the chassis. The chassis voltage is considered hazardous.

Note

NEBS Compliance Statements for GR-1089:

  • Only copper cables are to be used for grounding purposes.

  • The grounding conductor AWG size should match the size of the power cable AWG.

  • Bare conductors must be coated with antioxidant before crimp connections are made.

Installation Tools and Kits

  • Number 1 and Number 2 Phillips screwdrivers

  • 10 mm nut-driver

  • Wire stripping and crimping tool

  • Multimeter

  • Chassis Installation Kit (BT8A7865)

  • Chassis Crimp Lug Installation Kit (BT8A7867)

  • A grounding cable that is at least the same size as the power cable. The dual stud lugs supplied in the Chassis Crimp Lug Installation Kit are for use with 2 AWG cables. The 2 AWG lugs can crimp down to 4AWG.

Location of Ground Connections

There are two grounding locations on the rear of the chassis, one on each bottom corner beneath the PEMs.

Procedure

To frame ground the chassis, use the following procedure:

  1. Use a wire stripper tool to strip the end of the ground wire to the correct length (5.0 mm, 0.2 in) for crimping onto the supplied (dual stud) ring lugs.
  2. Insert the stripped end of the grounding wire into the open end of the lug.
  3. Use a ring lug crimping tool (do not use pliers) to secure the grounding wire in place in the lug.
  4. Use the two supplied hex screws and four lock washers (one on each side of each lug hole) to attach the lug to a grounding location on the chassis.

    Do not overtighten.

  5. Prepare the other end of the grounding wire with a dual stud lug, and connect it to the frame with the two screws and four lock washers (one on each side of each lug hole) supplied in the installation kit.
  6. Check the connectivity of the grounding by using a multimeter to measure the resistance between the shelf and the frame. Put one test lead in contact with an unpainted zone of the chassis and the other test lead in contact with the equipment frame. The measured resistance should be less than 1 Ohm.

You have successfully completed this procedure.

Frame-Grounding a BTI7802 Chassis

The BTI7802 uses DC-I grounding configuration with the return ground isolated from the frame ground.

Warning

You must complete this procedure before connecting power and powering on the chassis. The chassis voltage is considered hazardous.

Note

NEBS Compliance Statements for GR-1089:

  • Only copper cables are to be used for grounding purposes.

  • The grounding conductor AWG size should match the size of the power cable AWG.

  • Bare conductors must be coated with antioxidant before crimp connections are made.

Installation Tools and Kits

  • Number 1 and Number 2 Phillips screwdrivers

  • Wire stripping and crimping tool

  • Multimeter

  • Chassis Installation Kit (BT8A7865)

  • A grounding cable that is at least the same size as the power cable. The single stud lugs supplied in the Chassis Installation Kit are for use with 10-12 AWG cables.

Location of Ground Screw

The ground screw is located on the left side of the chassis and is accessible from the rear. It is identified by a grounding label.

  1. Use a wire stripper tool to strip the end of the ground wire to the correct length (5.0 mm, 0.2 in) for crimping the supplied ring lugs.
  2. Insert the stripped end of the grounding wire into the open end of the lug.
  3. Use a ring lug crimping tool (do not use pliers) to secure the grounding wire in place in the lug.
  4. Use the supplied screw and two lock washers (one on the top side and one on the bottom side of the lug) to attach the lug to a grounding position on the chassis. Tighten to 20 in-lb.
  5. Prepare the other end of the grounding wire with a lug, and connect it to the equipment frame with the screw and two lock washers (one on the top side and one on the bottom side of the lug) supplied in the installation kit.

    Do not overtighten.

  6. Check the connectivity of the grounding by using a multimeter to measure the resistance between the shelf and the frame. Put one test lead in contact with an unpainted zone of the chassis and the other test lead in contact with the equipment frame. The measured resistance should be less than 1 Ohm.

You have successfully completed this procedure.

Frame-Grounding a BTI7801 Chassis

The BTI7801 uses DC-I grounding configuration with the return ground isolated from the frame ground.

Warning

You must complete this procedure before connecting power and powering on the chassis. The chassis voltage is considered hazardous.

Note

NEBS Compliance Statements for GR-1089:

  • Only copper cables are to be used for grounding purposes.

  • The grounding conductor AWG size should match the size of the power cable AWG.

  • Bare conductors must be coated with antioxidant before crimp connections are made.

Installation Tools and Kits

  • Number 1 and Number 2 Phillips screwdrivers

  • Wire stripping and crimping tool

  • Multimeter

  • Chassis Installation Kit (BT8A7865)

  • A grounding cable that is at least the same size as the power cable. The single stud lugs supplied in the Chassis Installation Kit are for use with 10-12 AWG cables.

Location of Ground Screw

The ground screw is located on the left side of the chassis and is accessible from the rear. It is identified by a grounding label.

  1. Use a wire stripper tool to strip the end of the ground wire to the correct length (5.0 mm, 0.2 in) for crimping the supplied ring lugs.
  2. Insert the stripped end of the grounding wire into the open end of the lug.
  3. Use a ring lug crimping tool (do not use pliers) to secure the grounding wire in place in the lug.
  4. Use the supplied screw and two lock washers (one on the top side and one on the bottom side of the lug) to attach the lug to a grounding position on the chassis. Tighten to 20 in-lb.
  5. Prepare the other end of the grounding wire with a lug, and connect it to the equipment frame with the screw and two lock washers (one on the top side and one on the bottom side of the lug) supplied in the installation kit.

    Do not overtighten.

  6. Check the connectivity of the grounding by using a multimeter to measure the resistance between the shelf and the frame. Put one test lead in contact with an unpainted zone of the chassis and the other test lead in contact with the equipment frame. The measured resistance should be less than 1 Ohm.

You have successfully completed this procedure.