Your questions answered: Next-generation lighting: the emergence of PoE for lighting and controls

Your questions answered: Next-generation lighting: the emergence of PoE for lighting and controls.


John Casadonte, Product Marketing Manager, Cree Inc.Using Power over Ethernet (PoE) not only cuts installation and commissioning costs, but—more importantly—opens the door to endless building integration options that build upon the idea of intelligent or high-performance buildings. Read answers to questions that were not addressed in the live Sept. 20, 2016, webcast Next-generation lighting: the emergence of PoE for lighting and controls.

Question: Do you have case studies that compare a typical office building with fluorescent lamps versus an “equivalent” power over Ethernet (PoE) application?

John Casadonte: Please see this Quest case study for an example.

Question: What is the 90 W standard distance limitation?

Casadonte: 100 meters.

Question: What is the current technology maximum for a PoE wattage available on a given category cable for a lighting fixture?

Casadonte: A little over 100 W as the Cat-x will likely begin to overheat if pushed further. Expectations that new cable technology will be in place as the PoE standards grow.

Question: NFPA 70: National Electrical Code (NEC) requires complete separation of wiring for emergency lighting circuits. How do you configure your system to provide separation of normal power lighting from emergency?

Casadonte: A separate PoE switch and Cat-x cabling.

Question: How do we guard against obsolescence in cabling when Cat-8 is already on the horizon?

Casadonte: A tough question to address. Historically most data vendors have handled product/technology very gracefully, but we are now facing a tremendously fast ramp-up and it is likely some investments today may be lost as time progresses.

Question: Are the PoE lighting devices more energy efficient than their 120/277 V equivalents? That is comparing LED to LED.

Casadonte: About the same.

Question: Will the egress lighting/emergency be color indicating?

Casadonte: All depends on the luminaire. Speaking specifically on our Cree portfolio, we have field changeable color temperatures. In our case, the answer is yes.

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JACOB , FL, Venezuela, 11/10/16 10:38 AM:

1. Since PoE uses data cable for energy transmission, shouldn’t these cables be listed in Article 310 (Conductors for General Wiring) of the NEC, including Table corresponding ampacities?
2. As far as I understand, PoE is based on “one-cable for each luminaire”. Then, there is a lot of grouped cables required for any specific area. Are then Article 310.15(B)(2)(a) and 310.15(B)(3)(b) of the NEC (“Ambient Temperature Correction Factors” and “Adjustment Factors”) applicable to PoE?.
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