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The external connection box is connected electrically to the ultrasonic electronics
ex-factory and pre-assembled on the ultrasonic electronics. The external connec-
tion box does not have to be mounted.
Connection according to NEC 500
The number of lines that are permitted to be routed through the cable gland (½"
and ¾") on the electrics housing and flame block is limited. Accordingly, this re-
sults in 4 different constellations that reflect the possibilities for connection.
The numbers given below at each figure only counts the limited number of cables;
all cables are labeled due to the number of the basic upper terminal block
Version 1: Minimum assignment-½" sealing fitting
Fig. 8.7: ½" cable gland with 11 wires, size AWG 18
1
1½" sealing fitting, connected with 11 wires, size AWG 18 (permitted, max.
11; Killark Type ENY-1TM).
For this version, the ERZ 2000 or ERZ 2000 NG cannot be connected via the DZU
protocol (RS 485-1).
1
Terminal connections
8 Installation
Manual USM GT400 · EN10 · May 2021
105
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