What size RNC is needed to accommodate the conductors?
You have a Rigid PVC conduit (RNC), schedule 80, that is required to hold the following conductors; six -18AWG TFN, ten -18AWG XFF and four -16AWG XF.
¾”
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Insured costs for occupational injuries or deaths include _____.
a. pensions for dependents b. costs of investigations c. cost to train replacement workers d. first-aid expenses
A copper roof is being installed on a 300 ft tall building. A copper tile is dropped, and falls to the ground. Assume that there is no air resistance, and that the temperature of the copper tile stays constant (at 80oF) during its fall to the ground. When the copper tile hits the ground, all of its kinetic energy is converted into thermal energy, with no heat lost in the process. What is the temperature of the copper tile after it comes to rest on the ground?
Given: Cu; T1 = 80oF; z1 = 300 ft; z2 = 0 m Assume: Q = W = ?KE = 0 (the initial and final velocities are both 0 – the energy change in the fall is potential energy); The copper is an incompressible substance with constant specific heats: c = 0.092 Btu/lbm-R What will be an ideal response?
In the above figure, if the load increases and causes the motor to slow down, the voltage at the base of Q2 becomes more ____________________ (negative, positive), which causes Q3 to turn on ____________________ (less, harder), creating a more ____________________ (negative, positive) voltage at the base of Q1.
Fill in the blank(s) with the appropriate word(s).
The melt-through symbol is used only when complete root penetration plus visible root reinforcement is required in welds made from one side only.
Answer the following statement true (T) or false (F)