Concept explainers
Is it permissible to install a recessed luminaire directly against wood ceiling joists when the label on the luminaire does not indicate that the luminaire is suitable for insulation to be in direct contact with the luminaire? This is a Type Non-IC fixture.
Find whether the recessed luminaire is permitted to directly install against a wood ceiling joist when the label on the luminaire does not indicate that it can be used for insulation in contact with the recessed luminaire.
Answer to Problem 1R
No, the recessed luminaire is not permitted to directly install against a wood ceiling joist when the label on the luminaire does not indicate that it can be used for insulation in contact with the recessed luminaire.
Explanation of Solution
Discussion:
The National Electrical Code committee develops NEC – the standard electrical code and the main objective for the origin of the code is to protect and safeguard the person and elements from electrical hazards. The codes for clearance and installation of luminaire are defined in an article NEC 410.116.
According to an article NEC 410.116(A)(1), for Non-Type Insulated Contact(IC), the recessed luminaire which is not identified for the contact with the insulation should have recessed parts that are spaced not less than
The trim finishing and points of support of the openings in the walls, ceilings, or the other finished surfaces are allowed to be in contact with the combustible materials. Therefore, the recessed luminaire is not permitted to directly install against the wood ceiling joists when the label is not indicated on the luminaire.
Conclusion:
Thus, the recessed luminaire is not permitted to directly install against a wood ceiling joist when the label on the luminaire does not indicate that it can be used for insulation in direct contact with the recessed luminaire.
Want to see more full solutions like this?
Chapter 7 Solutions
Electrical Wiring Residential
Additional Engineering Textbook Solutions
Vector Mechanics for Engineers: Statics and Dynamics
Mechanics of Materials (10th Edition)
Database Concepts (8th Edition)
Electric Circuits. (11th Edition)
SURVEY OF OPERATING SYSTEMS
Concepts Of Programming Languages
- Consider the microgrid given in figure 8-56. The positive sequence impedance of the transmission Lines is given in -line diagram (figure 8.5%). The system data are as follows: the one PV generating Station: 2MW, 460V. AC, positive, negative and zero Sequence impedance of each line is equal to 10%. The generator negativ Sequence impedance is equal to the positive Sequence, and the Zero Sequence impedance is equal to half (½) of positiv Sequence impedance. Transformers positive sequence impedance is equal to the negative sequence and equal to the zero sequence impedance Station DC/AC CB Acpu bus CB www S+js 5 1+jlo M 2 T2 SB CB A Jus -3+16 local utilityarrow_forwarda) The current drawn by a single-phase converter is represented by the waveform in the figure below. Use Fourier series analysis to determine an expression for obtaining the rms values of the fundamental and the harmonics of the source current. Hence, express the rms value of the fundamental as well as the first three harmonics of the waveform. i(t) Id - Id π 元 b) Fig. Input current waveform of a single phase bridge rectifier A sinusoidal voltage with a peak value of 300 V is applied to the converter in (a) drawing a square-wave current with a peak value of 15 A. Assuming that the zero crossing of the current waveform is 45° behind that of the input voltage waveform, calculate: (i) the average power drawn by the converter, (ii) the form factor (FF) and ripple factor (RF) (iii) the total harmonic distortion (THD%) of the input current.arrow_forwardTransformer 600 V Transformer L₁ L₂ L3 4 (a) 600 V L₁ L₂ L3 L₁ (b) Figure 3.arrow_forward
- (2 marks) Using Kirchoff's voltage law: V(t) = VR(t) + Vc(t), show that the voltage drop across the resistor is given by the equation VR(t) jwRC 1+jwRC Voearrow_forwardA ferrite ETD44 core type material is to be used in the converter design. If Bmax = 0.52T, and 350 turns of 1.5x10³cm² copper wire is to be wound around the core material to allow a flow of 5A maximum current, compute for the (a) inductor resistance, and the (b) inductance.arrow_forwardDon't use ai to answer I will report you answerarrow_forward
- Please show the solution and answers each. Thank you.arrow_forwardA lossless resonant half-wavelength dipole antenna, with input impedance of 73 ohms, is connected to a transmission line whose characteristic impedance is 50 ohms. Assuming that the normalized pattern 000300 30° 90° 1 cos() of the antenna is given approximately by U(0) = 0.866 0 30° <0≤90° Find the maximum absolute gain of this antenna.arrow_forwardPlease show the solution and answers in each. Thank you.arrow_forward
- Please show how to solve this.arrow_forwardA rectangular waveguide with dimensions a = 1.2 cm, b = 3 cm is to operate below 7.5 GHz. How many TE and TM modes can the waveguide transmit? If the guide is filled with a medium characterized by (0-0, &=4, μ=1).arrow_forward7. Real diode limiter For the limiting circuit below, the diode is the same as in question 6. For each of the four Vout values from Q6, calculate the the Vin values. Remember to account for the voltage drop across the resistor. Note that in these circuits with an input and an output, the input can source current but no current flows to the output unless an explicit load resistor is shown. 1 k Vin Voutarrow_forward
- EBK ELECTRICAL WIRING RESIDENTIALElectrical EngineeringISBN:9781337516549Author:SimmonsPublisher:CENGAGE LEARNING - CONSIGNMENTElectricity for Refrigeration, Heating, and Air C...Mechanical EngineeringISBN:9781337399128Author:Russell E. SmithPublisher:Cengage Learning