Intermatic UG40 Installation Instructions And Operating Manual

UG40 MODULAR SYSTEM

INSTALLATION INSTRUCTIONS

and

OPERATIONS MANUAL

T

URN OFF POWER TO THE ELECTRIC SERVICE OR PANEL AND TO EQUIPMENT TO BE PROTECTED

BEFORE INSTALLING ANY

S

URGE

P

ROTECTION

D

EVICE

. A

LL WIRING SHOULD COMPLY WITH THE

N

ATIONAL

E

LECTRIC

C

ODE AND LOCAL ELECTRIC CODES

.

INSTALLATION

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).

MOUNTING

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.  

WIRING

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.

CAUTION: