Services & DistributionPregunta 54 de 110
A metal underground water pipe qualifies as a grounding electrode if it is in direct contact with earth for at least how many feet?
a.10 ft
b.5 ft
c.3 ft
d.1 ft
Explicación
A metal underground water pipe electrode must have at least 10 ft of contact with earth (bonding connection made within 5 ft of entry).
Referencia Legal: 2023 NEC 250.52(A)(1)Practica las 110 preguntas gratis — sin registro.
Preguntas relacionadas de este tema
- A legally required standby system must supply its loads within what maximum time after loss of normal power?
- Generator output conductors must have an ampacity of at least what percent of the nameplate current?
- A feeder supplies a 60,000-VA, 208-V, three-phase load. What is the calculated feeder current?
- A 200-A busbar has a 200-A main breaker at one end. Using the 120% rule, what is the maximum back-fed inverter (PV) overcurrent device at the opposite end?
- A single made electrode (ground rod) must be supplemented unless its resistance to earth does not exceed what value?
- A concrete-encased electrode (Ufer) must consist of at least how many feet of #4 or larger rebar or bare #4 Cu conductor?
Última revisión: · proceso editorial
Equipo Editorial de PrepPass · Verificado con Master Electrician Licensing Exam (NEC-based) · Cómo revisamos