RCDD · Question #115
The MINIMUM dimensions of the telecommunications main grounding busbar is ________ and variable in length.
The correct answer is B. 6.3 mm (0.25 in) x 100 mm (4 in). This question tests recall of the ANSI/TIA-607 specified minimum physical dimensions for the telecommunications main grounding busbar (TMGB).
Question
The MINIMUM dimensions of the telecommunications main grounding busbar is ________ and variable in length.
Options
- A4 mm (0.16 in) x 80 mm (3.15 in)
- B6.3 mm (0.25 in) x 100 mm (4 in)
- C8 mm (0.31 in) x 110 mm (4.33 in)
- D10.5 mm (0.41 in) x 140 mm (5.51 in)
- E12.75 mm (0.50 in) x 175 mm (6.89 in)
How the community answered
(31 responses)- A13% (4)
- B77% (24)
- D6% (2)
- E3% (1)
Why each option
This question tests recall of the ANSI/TIA-607 specified minimum physical dimensions for the telecommunications main grounding busbar (TMGB).
4 mm x 80 mm falls below the minimum thickness and width specified by ANSI/TIA-607, making it non-compliant for use as a TMGB.
ANSI/TIA-607 specifies the TMGB minimum dimensions as 6.3 mm (0.25 in) thick by 100 mm (4 in) wide, with length variable to accommodate the number of bonding conductor terminations required at the site. These dimensions ensure adequate mechanical strength and sufficient surface area for reliable conductor connections.
8 mm x 110 mm exceeds the minimum dimensions and would be acceptable, but does not represent the minimum specified by the standard.
10.5 mm x 140 mm is larger than the minimum requirement and does not match the standard's defined minimum dimensions.
12.75 mm x 175 mm is substantially larger than the minimum and does not represent the minimum dimensions defined by ANSI/TIA-607.
Concept tested: TMGB minimum physical dimensions per ANSI/TIA-607
Source: https://www.tiaonline.org/standards/tia-607-c/
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