RCDD CH8 BONDING & GROUNDING (EARTHING) WITH VERIFIED SOLUTIONS

B The GEC for the main electrical service entrance for a building is 4 AWG [5.2 mm (0.20 in). What should be the size of the bonding conductor that is 50 m (164 ft) in length? A - 1 AWG [7.3 mm (0.29 in) B - 3 AWG [5.8 mm (0.23 in) C - 4 AWG [5.2 mm (0.20 in) D - 6 AWG [4.1 mm (0.16 in) Page 8-25 A What are the two main components of ac grounding (earthing) electrode system? A - Grounding electrode conductor (GEC) and grounding (earthing) electrode B - Equipment grounding (earthing) conductor and supplementary bonding grid (SBG) C - Grounding electrode conductor (GEC) Distracter and isolated ground (IG) Page 8-5 B What is the maximum recommended length for a BCT? A - ≈8 m (26 ft) B - ≈9 m (30 ft) C - ≈10 m (33 ft) D - ≈12 m (40 ft) Page 8-19 A Which of the following is intended to equalize potentials between TRs on multiple floors of a building? A - Telecommunications bonding backbone (TBB) B - Grounding equalizer (GE) C - Telecommunications main grounding busbar (TMGB) D - Telecommunications grounding busbar (TGB) Page 8-21 D You are designing an ICT system where the bonding conductor will not exceed ≈30 m (100 ft). Which bonding conductor is sufficient for referencing all metallic surfaces within the telecommunications environment? A - 1 AWG B - 2 AWG C - 4 AWG D - 6 AWG Page 8-22 C An 11-story building has an equipment room (ER) and an entrance facility (EF) on the first floor. All other floors have at least two telecommunications rooms (TRs). Where will you need to install grounding equalizers (GEs) in order to equalize the potential between the TRs on the same floor? A - 1st, 4th, 7th, and 10th floors B - 2nd, 5th, 8th, and 11th floors C - 3rd, 6th, 9th, and 11th floors D - 4th, 8th, 9th, and 10th floors Page 8-22 B What is the maximum value recommended for the bonding resistance between a grounding electrode and a busbar in the entrance facility (EF)? A - 0.05 ohms B - 0.10 ohms C - 0.80 ohms D - 1.00 ohm Page 8-26 C What is the recommended maximum value suggested by IEEE® 1100, Recommended Practice for Powering and Grounding Electronic Equipment, for impedance of the telecommunications equipment grounding (earthing) conductor for ac circuits of 120 V to ground? A - 0.5 ohms B - 0.8 ohms C - 1.0 ohm D - 1.2 ohms Page 8-9 A Which of the following is intended to equalize potentials between telecommunications rooms (TRs) on the same floor of a structure? A - Grounding equalizer (GE) B - Telecommunications bonding backbone (TBB) C - Telecommunications main grounding busbar (TMGB) D - Telecommunications grounding busbar (TGB) Page 8-21 A Which of the following should be used when assessing the risk of loss due to lightning? A - NFPA 780 B - EIA/TIA 607B C - NFPA 70 D - ANSI/NECA/BICSI-607