
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
EBK 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
- Please solve these 3 questions in detailarrow_forward1. Please draw the root locus by hand for the following closed-loop system, where G(s) s+8 S-2 and H(s) = Find the range of K for stability Input R(s) Output C(s) KG(s) H(s) s+6 = S-2arrow_forwardThe state-space Jordan Canonical Form of the following system is: Y(s) 8-5 U(s) (+1)(+3) Select one: O a. -1 0 0 A = 0 -1 0 B: ... ... ... 0 0 C [4 1.5 1.5], D=0 b. -3 1 0 0 A = 0 -3 0 1 B ... 0 0 -1 C -4 -1.5 1.5], D=0 ○ C. -3 1 0 A = 0 -3 0 1 ,B= ... 0 0 ○ d. C [4 1.5 1.5], D=0 -3 1 0 0 A = 0 -3 0 1 , B: ... ... 0 0 -1 C [4 1.5 1.5], D=0 -4 1 If= x and (0): = then 2(t) is: -4 0 Select one: a. x2(t)=4te2t O b. x2(t) = e2t+2te2t Oc. 2(t)=-4te-21 Od. 2(t) e2-2te-2 =arrow_forward
- Three speech signals are TDM multiplexed with a high-quanty music signal. It each speech signal is sampled at 16 kHz and PCM quantized by 8 bits/sample, while the music signal is sampled at 64 kHz with the same PCM quantizer. 1. Draw the block diagram of this TDM. 2. Calculate the output bit rate of this TDM.arrow_forward3- For the network below determine the value of R for maximum power to R (use Thevenin equivalent) and determine the value of maximum power R₁ 1.2Ω E + 12 V I D 10 A R₂60 6Ω Rarrow_forwardPlease solve this problem in detail to understandarrow_forward
- Q3: (40 Marks) Single phase full bridge voltage source inverter has an RLC load with R-1002, L-31.5mH and C=112µF. The inverter frequency is 60Hz and de input voltage is 220V. (a) Express the instantaneous load current in Fourier series to third harmonic. (b) Calculate the RMS load current at the fundamental frequency (n=1). (c) Calculate the load power due to fundamental component (n=1).arrow_forward12.3 Express each of the waveforms in Fig. P12.3 (on page 667) in terms of step functions and then determine its Laplace transform. [Recall that the ramp function is related to the step function by r(t − T) = (t − T) u(t − T).] Assume that all waveforms are zero for t<0. - - -arrow_forwardEvaluate each of the following integraarrow_forward
- With the aid of suitable diagrams, describe the benefits that antenna arrays have over singleelement antennas, with their applicationsarrow_forwardExplain what is meant by an electric dipole antenna, sketch its radiation pattern, state itsdirectivity and describe its main applicationsarrow_forwardEstimate the length required for a half-waveelectric dipole antenna for transmitting/receiving EM waves at 800 MHz (this is in the UHFbandwidth of 470 to 860 MHz, used for UK TV transmissions).arrow_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

