Electrical Safety and Grounding Flashcards

What is the maximum acceptable ground resistance for a properly installed communication tower grounding system?

Answer: 10 ohms

Industry and TIA standards generally require tower grounding resistance to be 10 ohms or less for effective lightning and fault current dissipation.

Arc flash rated PPE must be worn when a worker is:

Answer: Within the arc flash boundary of energized electrical equipment

Workers must wear arc flash rated PPE whenever they are within the arc flash boundary established by the site's hazard analysis for energized equipment.

Temporary protective grounds must be installed on de-energized electrical conductors:

Answer: Before any work begins to protect against accidental re-energization

Temporary grounds must be applied before work begins on de-energized conductors to protect against inadvertent re-energization from any source.

What is the minimum copper conductor size typically required for a communication tower grounding conductor per industry standards?

Answer: 6 AWG copper

A minimum of 6 AWG copper is typically specified for tower grounding conductors to handle the high-current demands of lightning events.

An assured equipment grounding conductor program (AEGCP) on a construction site is an acceptable alternative to:

Answer: GFCI protection for cord-connected equipment

Under OSHA 1926.404(b)(1)(ii), a written and enforced AEGCP is an approved alternative to GFCI protection for cord-connected tools and equipment on construction sites.

Capacitors in recently de-energized electrical equipment are dangerous because they:

Answer: Can still deliver a lethal shock even after the power source is disconnected

Capacitors store electrical charge and can release it as a dangerous or lethal shock even when the power supply has been disconnected.