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Section 2 - Minimum Installation Requirements
(E-Compact ATSC Transmitters)
2.2.1.4 Wire Gage
Wire gage calculation (phases and neutral)
P
I
=
E
3
* Measurement made with the transmitter operating at rated power while transmitting a black
burst signal.
Grounding wire gage calculation
The ground flowing current must be considered as 10% of the consumed current between
phases and/or neutral.
Examples:
1) TV Transmitter LD710K 220V three-phase / 38 kVA
I =
220
2) TV Transmitter LD710K 380V three-phase / 38 kVA
I =
380
2.3
Atmospheric Discharge Protection System
2.3.1 Lightning Arresters
The Atmospheric Discharge Protection System comprises the lightning arresters and their
elements. The tower and the shelter where the equipment is installed must be protected against
atmospheric discharges by means of FRANKLIN-type lightning arresters, which must be designed
and installed by the USER in accordance with the criteria set forth by standard NBR 5419 (in its
latest version) and in such a way that the whole station is covered by the protection zone as
defined by the electrogeometric model of rolling spheres Level I.
Manual Rev. 0.1 – September 2014
Where:
I: current between phases (in Ampere)
E : Voltage between phases:
Three-phase 220V: E = 220V
•
Three-phase 380V: E = 380V
•
38.000
I = 99,7A
3
38.000
I = 57,7A
3
P: Maximum apparent power* (in
VA) consumer by the transmitter
Recommended cables:
PHASES and NEUTRAL: 35mm
•
GROUND: In according standard NBR 5410/2004
•
Recommended cables:
PHASES and NEUTRAL: 16mm
•
GROUND: In according with standard NBR 5410/2004
•
2
or AWG 1
2
or AWG 4
2-4
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