RCDD · Question #117
You are designing a telecommunications grounding system for a telecommunications room (TR). The TMGB is located 15 m (50 ft) from the telecommunications rack. What is the MINIMUM AWG of the ground…
The correct answer is D. Six. ANSI/TIA-607 specifies minimum bonding conductor sizes for telecommunications grounding based on run length. At 15 m (50 ft), a 6 AWG copper conductor is the minimum acceptable size between the TMGB and telecommunications equipment.
Question
You are designing a telecommunications grounding system for a telecommunications room (TR). The TMGB is located 15 m (50 ft) from the telecommunications rack. What is the MINIMUM AWG of the ground conductor required?
Options
- ATwo
- BThree
- CFour
- DSix
- EEight
How the community answered
(31 responses)- A13% (4)
- B3% (1)
- C10% (3)
- D71% (22)
- E3% (1)
Why each option
ANSI/TIA-607 specifies minimum bonding conductor sizes for telecommunications grounding based on run length. At 15 m (50 ft), a 6 AWG copper conductor is the minimum acceptable size between the TMGB and telecommunications equipment.
2 AWG is a physically larger, lower-impedance conductor that exceeds the minimum requirement and is therefore not the minimum AWG.
3 AWG is a larger conductor than the minimum required and is not the minimum AWG specified by TIA-607 for this distance.
4 AWG exceeds the minimum specification and is not the minimum AWG required for a 15 m bonding conductor run.
Per ANSI/TIA-607-C/D, the minimum bonding conductor size from the TMGB to telecommunications racks at distances up to approximately 15 m (50 ft) is 6 AWG copper. This gauge meets the standard's impedance and fault-current carrying requirements for that run length. Using a smaller gauge such as 8 AWG would exceed the maximum allowable resistance and not comply with the standard.
8 AWG is a smaller, higher-resistance conductor that falls below the 6 AWG minimum required by ANSI/TIA-607 for a 15 m run, making it non-compliant.
Concept tested: TIA-607 TMGB bonding conductor minimum AWG sizing
Source: https://tiaonline.org/standard/tia-607-d/
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