Codes & SafetyPregunta 114 de 120
A crew is setting sewer pipe in a trench 5 ft 6 in deep with vertical walls cut in previously disturbed soil. No sloping, shoring or shielding has been installed. What does OSHA require before a worker enters?
a.Nothing, because a protective system is required only at 6 ft and greater
b.A warning line at the top of the trench and a spotter watching the walls are sufficient at this depth
c.A protective system such as sloping, benching, shoring or a trench shield must be in place, because the excavation is 5 ft or more in depth
d.The competent person may waive protection if the trench will be open for less than one work shift
Explicación
Employees in an excavation 5 ft deep or more must be protected by an adequate protective system, and the only exception is an excavation made entirely in stable rock. The 6 ft figure is a fall-protection threshold, not the trenching trigger. A warning line and a spotter do nothing to stop a wall from collapsing on someone standing in the trench. The competent person can require protection at less than 5 ft when there are signs of a cave-in hazard, but has no authority to waive it based on how long the trench will stay open.
Referencia Legal: 29 CFR 1926.652(a)(1)Practica las 120 preguntas gratis — sin registro.
Preguntas relacionadas de este tema
- A floor plan is drawn at a scale of 1/4 in = 1 ft. A straight run of cold water piping measures 3-1/2 in on the drawing. What is the actual length of that run?
- A site plan shows the invert elevation of a building sewer as 102.50 ft at the upstream end and 101.90 ft at the downstream end, with 48 ft of run between the two points. What is the slope of the sewer in inches per foot?
- A building sewer runs 62 ft from the building drain to the connection at the main and is to be graded at 1/4 in per foot. The invert elevation at the upstream end is 100.00 ft. What is the invert elevation at the downstream end?
- A trench 7 ft deep with a 3 ft wide bottom is excavated in Type C soil and will be protected by sloping the walls at 1-1/2 to 1. How wide must the excavation be at the top?
- A trench 5 ft deep and 90 ft long is open, with workers spread along its full length installing pipe. What is the minimum number of ladders required and how must they be placed?
- A trench must be excavated 22 ft deep in Type B soil to reach an existing sewer main. Which statement about the protective system and the excavated material is correct?
Última revisión: · proceso editorial
Equipo Editorial de PrepPass · Verificado con Journeyman Plumber Licensing Exam (UPC/IPC-based) · Cómo revisamos