Intermatic ug40 modular ユーザーズマニュアル

1.

TEST and verify system voltage to assure proper selection of the Surge Protection Device (SPD) in accordance 
with the wiring diagrams shown on page 2. Turn off the electric power to the panel. 

2.

CONFIRM that the Surge Protection Device is the proper voltage configuration for this installation. Refer to the 
installation diagrams for additional information.

3.

SELECT a location to mount the UG40 cabinet. Mount as close as possible to the electric panel or individual 
piece of equipment to be protected. The UG40 should be mounted on a flat vertical surface that can support the 
weight of the device. Consideration should be given to the available knockout positions in the panel when decid
ing where to locate the UG40. All wire leads should be kept as short as possible to insure optimum operation.  

4.

The internal disconnect switch and associated 100 KAIC fuses are the prime current protection devices for the 
UG40; therefore, lead wires  may be connected to either a bus bar or a multi-pole breaker.  If connected to a 
breaker, use a 30 to 100 amp breaker with the appropriate number of poles. Panel breakers will not trip from 
surge activity due to their inherent slow response.

NOTE: For installations connecting directly to bus bar, the UG40 must be less than ten feet (10’) wire distance from
the bus bar to qualify the internal disconnect switch and fuses as the primary overcurrent device in accordance with
the NEC 10 foot rule 240-21(b).

1.

Attach the upper and lower mounting rails to the UG40 Cabinet using the screws provided.  

2.

Pre-drill holes in the surface on which the UG40 will be mounted.  Use at least four (4) appropriate size mounting 
screws or bolts.  

3.

Select and remove the proper size knockout from the UG40 cabinet. Install conduit, sealtite or other proper wire 
protection between the panel and the UG40.  

1.

For installations using less than two feet of wire for each lead, use at least 8 AWG stranded wire. For installations 
requiring up to four feet of wire for each lead, use a minimum wire size of 6 AWG. Use 4 AWG minimum for over 
6 foot lead length. Refer to section 3 under INSTALLATION if lead length is over 6 foot.  

2.

Measure and cut all leads to proper length, keeping in mind that leads should be as short and straight as possible.

3.

Tape all wires together to minimize inductive coupling. 

4.

Route the wire lead bundle through the conduit to the panel.  

5.

Connect the GROUND (green) lead to the ground bus in both the UG40 and the electric panel. 

6.

If used, connect the NEUTRAL (white) to the neutral fuse terminal in the UG40 and the neutral bus in the electric 
panel. If installing at the main distribution panel, the neutral and ground leads could terminate at a common bus 
bar in the panel.  

7.

Connect the phase leads to the disconnect switch in the UG40.  Then connect them to the appropriate breaker or 
bus connections in the electric panel. NOTE: For HIGH LEG DELTA, make certain that the high leg is connected 
to the center switch position in the UG40.(Refer to Figure 3)  For GROUNDED PHASE DELTA, make certain that 
the grounded phase is connected to the center switch position in the UG40.(Refer to Figure 4) 

8.

Connect wires to the alarm relay terminals. Alarm wires should be routed through a knockout that is separate from
the power leads. (Refer to alarm wiring drawings)

9.

CHECK  all connections for tightness. 

10. REPLACE Disconnect Switch Cover.

11. REPLACE Dead-front panel.