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APPENDIX 2 Instructions for UL and cUL
(Standard to comply with: UL 508C, CSA C22.2 No. 14)
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 P and N with a meter etc., to avoid a
hazard of electrical shock.
2. Installation
(1) The FR-HC units have been approved as products for use in an enclosure. Please refer to the following
UL’s requirement for the enclosure.
* The minimum enclosure size is 150 percent of each converter and inverter combination, which must be
provided with ventilation openings on each side near the top.
* The minimum area for the ventilation openings must be 55 percent of the overall surface area of each
side and be located in the top quarter of the side. The maximum width of each individual vent must be
3.17mm (1 / 8 in.).
(2) The FR-HC-H55K have been approved on the following condition.
* A 2.8 m
3
/min {100 cfm } fan must be used spaced 10cm (4 in.) above the FR-HC-H55K and FR-HCB-
H55K.
*Two 2.8 m
3
/min {100 cfm } fans for air circulation for the FR-HCL02-H55K must be used as shown in
the following illustrations.
3. Branch circuit protection
For installation in United States, branch circuit protection must be provided, in accordance with the
National Electrical Code and any applicable local codes.
For installation in Canada, branch circuit protection must be provided in accordance with the Canada
Electrical Code and any applicable provincial codes.
4. Short circuit ratings
Suitable For Use in A Circuit Capable Of Delivering Not More Than 5 kA rms Symmetrical Amperes, 500
Volts Maximum.
5. Wiring
When wiring the I/O terminals and control circuit, use UL-approved, 75°C or higher rated copper wires
and round crimping terminals and screw them to the specified tightening torque . Crimp the crimping
terminals with the crimping tool recommended by the terminal maker.
Top view
Front view
10 to 20 cm
(4 to 8 in.)
10 to 20 cm
(4 to 8 in.)