Mitsubishi Electric FR-A741-5.5K Installation Manualline page 32

APPENDIX
A.2 Instructions for UL and cUL
(Standard to comply with: UL 508C, CSA C22.2 No.14)
A.2.1 General precaution
The bus capacitor discharge time is 10 minutes. Before starting wiring or inspection, switch power off, wait for more than
10 minutes, and check for residual voltage between terminal P/+ and N/− with a meter etc., to avoid a hazard of electrical
shock.
A.2.2 Installation
The below types of inverter have been approved as products for use in enclosure and approval tests were conducted
under the following conditions.
Design an enclosure so that the inverter ambient temperature, humidity and atmosphere satisfy the specifications. (Refer
to page 2).
Wiring protection
For installation in the United States, branch circuit protection must be provided in accordance with the National Electrical
Code and any applicable provincial codes.
For installation in Canada, branch circuit protection must be provided in accordance with the Canada Electrical Code and
any applicable provincial codes.
As specified, UL Class T fuses or any faster acting fuse with the appropriate rating must be employed.
FR-A741- -K 5.5
Rated voltage [V]
Fuse maximum
40
allowable rating [A] *
* Maximum allowable rating by US National Electrical Code. Exact size must be chosen for each installation.
A.2.3 Short circuit ratings
Suitable for use in a circuit capable of delivering not more than 100 kA rms symmetrical amperes, 528 V maximum.
A.2.4 Wiring
The cables used should be 75 °C copper cables.
Tighten the terminal screws to the specified torques.
Undertightening can cause a short or misoperation.
Overtightening can cause the screws and unit to be damaged, resulting in a short or misoperation.
Use the UL approved round crimping terminals. Crimp the terminals with the crimping tool recommended by the terminal
manufacturer.
26
7.5 11 15
70 80 90
018.5 22 30
480V or more
110 150 175
37 45 55
200 250 300