Bender MarinaGuard User manual

MarinaGuard®
MG-1
Ground Fault Monitoring Panel
For Marina Shore Power
EN Manual

2
MarinaGuard © 2023 Bender Inc. All Rights Reserved
Table of Contents
1. Introduction......................................................................................... 4
1.1 MarinaGuard ....................................................................................... 4
1.2 Monitored Circuit .............................................................................. 4
1.3 Current Transformers....................................................................... 4
2. Safety Instructions..............................................................................5
2.1 General Safety Warning .................................................................. 5
2.2 Using This Manual............................................................................. 6
3. Installation and Connection ............................................................. 7
3.1 Internal Components....................................................................... 7
3.2 Dimensions.......................................................................................... 8
3.3 Mounting ............................................................................................. 9
3.4 Conduit ............................................................................................... 9
3.5 Wiring - General Instructions ...................................................... 10
3.5.1 Wire Size and Type ......................................................................... 10
3.5.2 Wire Strip Length ............................................................................ 10
3.5.3 Recommended Tightening Torque ......................................... 10
3.6 Wiring ................................................................................................. 11
3.6.1 Control Power and Ground Connections .............................. 11
3.6.2 Current Transformer Connection ............................................. 12
3.6.3 External Trip Circuit Connection ............................................... 13
3.6.4Wiring Block Diagram Reference .............................................. 14
3.7Current Transformer Installation .............................................. 15
3.8Field Adjustments - MG1.2 ......................................................... 16
3.8.1 RCM420 Ground-Fault Relay ..................................................... 16
3.8.2 Main Alarm ....................................................................................... 16
3.8.3 Pre-Trip Alarm ................................................................................. 16
3.8.4 Time Delay ....................................................................................... 16
3.8.5 Digital Display ................................................................................ 16
3.8.6 RCM420 Interface Elements ...................................................... 17
3.8.7 Using the Push Buttons .............................................................. 18
3.8.8 Password Protection ................................................................... 18

3MarinaGuard © 2023 Bender Inc. All Rights Reserved
3.8.9 Change Trip Level ........................................................................... 19
3.8.10 Change Trip Time Delay ..................................................... 20
3.8.11 Change Password ........................................................................... 21
3.8.12 Factory Default Settings ............................................................... 22
4. Operation........................................................................................... 23
4.1 Panel Interface Elements ............................................................ 23
4.2 Applying Power ............................................................................. 24
4.3 Performing a Functional Test ..................................................... 24
5. Troubleshooting................................................................................25
5.1 General Troubleshooting............................................................. 25
5.2 Fuse Replacement .......................................................................... 25
5.3 Error Codes ....................................................................................... 26
5.4Technical Specifications .............................................................. 26
6.Ordering Information ......................................................................... 27
6.1 MarinaGuard.................................................................................... 27
6.2 Current transformers .................................................................... 28
7. Certifications...................................................................................... 29

Introduction
4
MarinaGuard © 2023 Bender Inc. All Rights Reserved
1. Introduction
1. 1 MarinaGuard
MarinaGuard UL Listed Ground-Fault Protection Panels detect ground
faults in feeder and branch circuits of electrical systems in marinas,
boat yards, floating buildings, docking facilities, and similar locations. When
correctly installed, MarinaGuard panels satisfy the requirements of National
Electrical Code 555.35 (A) & (B)(1), 555.53 & 682.15 (B) (2023 edition); NEC
555.32, 555.35 (A)(1) & (3), 555.53, & 682.15 (B) (2020 edition); NEC 555.3 &
682.15 (2017 and earlier editions); and Canadian Electrical Code 78-052. The
trip level can be set below the maximum Code-allowed trip level, if desired
and the trip time can be adjusted for coordination with downstream
protection. External current transformers, purchased separately and
installed in distribution equipment, are used for measuring ground-fault
current. Shunt-trip circuit breakers are required to interrupt the faulted circuit
in the event of a ground fault. MarinaGuard panels require a site-supplied
120-Vac control voltage.
MarinaGuard features a lockable non-metallic type 4X enclosure suitable
for outdoor use. A red strobe light mounted to the top of the enclosure
provides clear visual indication of a trip or internal malfunction, and a "weep"
fitting allows condensed moisture to drain.
1. 2 Monitored Circuit
The MG-1.3 provides monitoring for a single circuit. The monitored circuit can
be a single, split, or three-phase configuration. A ground fault in the circuit on
the load side of the current transformer will be detected.
1. 3 Current Transformers
Each monitored circuit requires a single ground-fault current transformer
installed in the electrical-distribution equipment, with its secondary winding
connected to the MarinaGuard panel. Current transformers are ordered
separately and must match application requirements. Bender CTAC series
CT’s are compatible with MarinaGuard panels. See the CT datasheet for
additional information.

5MarinaGuard © 2023 Bender Inc. All Rights Reserved
Safety Instructions
2. Safety Instructions
2. 1 General Safety Warning
Hazard of Electric Shock, Burn, or Explosion
Only qualified maintenance personnel should operate or service this equip-
ment. These instructions should not be viewed as sufficient for those who are
not otherwise qualified to operate or service this equipment. No responsibility
is assumed by BENDER for any consequences arising from use of this docu-
ment.
Turn OFF all sources of electric power before performing any inspections, tests,
or service on this equipment. Assume all circuits are live until they have been
properly de-energized, tested, grounded, and tagged. Failure to observe these
precautions will result in equipment damage, severe personal injury, or death.
Proper operation of this equipment depends on proper installation. Refer to
NFPA 70, NFPA 70E, CSA Z462, and other relevant standards and codes for
installation standards. Neglecting fundamental installation techniques will
result in equipment damage, severe personal injury, or death.
Do not make any modifications to the equipment. Failure to observe this pre-
caution will result in equipment damage or personal injury.
Use only manufacturer’s and manufacturer recommended accessories with
this equipment. Failure to do so may damage the equipment beyond repair.
To prevent unauthorized access, the panel should be locked unless being ser-
viced by qualified personnel.
!
DANGER

Safety Instructions
6
MarinaGuard © 2023 Bender Inc. All Rights Reserved
2. 2 Using This Manual
Read these instructions carefully and become familiar with the equipment
before attempting to install, operate, or service it. Throughout this manual,
special messages may appear to warn of potential safety hazards or to call
attention to information which clarifies instructions or procedures. Observe all
safety messages that appear throughout this manual to avoid possible injury
or death. An explanation of these symbols is given below.
DANGER: Indicates a hazardous situation which, if
not avoided, will result in death or severe injury.
WARNING: Indicates a potentially hazardous situa-
tion which, if not avoided, may result in death or injury.
CAUTION: Indicates a potentially hazardous situation
which, if not avoided, may result in injury or equipment
damage.
NOTE: Provides additional information to clarify in-
structions for a product or procedure.
D
AN
G
ER
WARNIN
G
C
A
U
TI
O
N

7MarinaGuard © 2023 Bender Inc. All Rights Reserved
Installation and Connection
3. Installation and Connection
3. 1 Internal Components
1Terminal blocks for external 120 VAC control power and ground
2Power indicating light - illuminates when control voltage is applied to
panel, even if internal circuit breaker is open
3Branch-circuit-rated circuit breaker - protects internal components
and external trip circuit
4RCM420 ground fault relay
5Terminal blocks for external trip circuit and current transformer
6Fuse holder - contains fuse protecting RCM420
7Strobe light - flashes when ground fault is detected and circuit
has tripped, the fuse is open, or the RCM420 malfunctions
Iǻn
R/T
21
1222
11
42
41
lk
T
NO
M
RNEU
2LA1LA
024MCR
R/T1A2A
41
2A
9
1A
31
11
21
1
5
41
Control L1
Control N Control N Ground
120 VAC
Shunt L1
Shunt N
Current trans. l
Current trans. k
1
3
4
5
7
2
6

Installation and Connection
3. 2 Dimensions
Dimensions shown in inches (mm). Mounting feet are shown installed. A
weep hole is provided on the bottom of the panel to comply with NEC 555.32
(2020 & 2023 editions) and 555.11 (2017 and earlier editions).
The enclosure is lockable.
Front View with Strobe Side View
Bottom View Rear View
11.4"
(290)
13.4"
(341)
(425)
7.05”
(179) 0.44”
(11.2)
12.68"
(322)
7.38”
(187.5)
1.18”
(30)
7.87”
(199.9)
10.81"
(275)
7.63"
(194)
14.03"
(356)
9.63"
(245)
Model Weight
MG-1.39.4 lb. (4.3 kg)
16.75"
10.25"
(260) 11.95"
(304)
12"
(305)
8
MarinaGuardMarinaGuard © 2023 Bender Inc. All Rights Reserved

9MarinaGuard © 2023 Bender Inc. All Rights Reserved
Installation and Connection
3. 3 Mounting
Mounting feet are included with MarinaGuard panels. Place the mounting
brackets over the octagon bosses. Fasten them to the enclosure using the
provided 1/4”-20 x 0.25” SS, countersunk Phillips drive screws (30 in-lb torque
limit).
3. 4 Conduit
• Conduit shall be installed at the lower left or lower right sides of the panel.
• Conduit holes may be cut using standard hole saws. Secure the conduit,
the connector, and the locknut through a pre-drilled hole.
• For metallic conduit, secure a grounding bushing over the connector lock-
nut. All threaded inserts in the enclosure and for cover attachment are
brass #10-32.
NOTE: Mount the panel vertically, with the strobe light
on the top.
NOTE: Any fittings used must comply with any govern-
ing electrical code or requirements. Any fittings must
also maintain the application-required enclosure rat-
ing.

Installation and Connection
10
MarinaGuard © 2023 Bender Inc. All Rights Reserved
3. 5 Wiring - General Instructions
3.5.1 Wire Size and Type
Use minimum 22, maximum 14 AWG wire. Use copper wire only. Current
transformer connections must be made with 600 V rated conductors.
3.5.2 Wire Strip Length
3.5.3 Recommended Tightening Torque
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR
ARC FLASH
This equipment must only be installed and serviced
by qualified personnel.
Disconnect all power before servicing.
Observe all local, state, and national codes, stand-
ards and regulations when installing this equip-
ment.
Failure to follow these instructions will result in
death or severe injury.
Type Wire Strip Length
All terminal blocks in MG-1 0.39” (10 mm)
Type Tightening Torque
All terminal blocks in MG-1 5.0 - 5.6 lb-in (0.6 N-m)
D
AN
G
ER

11 MarinaGuard © 2023 Bender Inc. All Rights Reserved
Installation and Connection
3. 6 Wiring
3.6.1 Control Power and Ground Connections
Locate the connections labeled as Number 1 in the diagram in Section 3.1
(Page 7). Refer to the wiring diagram below. Use 120 VAC, 60 Hz, grounded
power only. Make the connections to the top side of terminal blocks.
A branch-rated circuit breaker is provided to protect internal components,
protect the external trip circuit, and allow connection to a feeder tap.
Connection to a feeder tap increases the security of the ground-fault
protection panel by making it electrically tamper resistant. Use a padlock to
restrict access to internal components.
The L1 terminal block contains an indicating light, illuminating when control
voltage is applied to the panel, regardless of the state of the internal circuit
breaker.
Control L1
Control N Control N Ground
120 VAC
120 VAC, 60 Hz
N
L

Installation and Connection
12
MarinaGuard © 2023 Bender Inc. All Rights Reserved
3.6.2 Current Transformer Connection
Locate the connections labeled as Number 5 in the diagram in Section 3.1
(Page 7). Refer to the wiring diagram below. Make the connections to the
bottom side of the terminal blocks.
Refer to Section 3. 7 for instructions on routing system conductors through
the current transformer.
Sh
unt L1
S
h
unt
N
Current trans.
l
Current trans. k

13 MarinaGuard © 2023 Bender Inc. All Rights Reserved
Installation and Connection
3.6.3 External Trip Circuit Connection
A powered, non-fail-safe (normally open), output is provided to connect to
an interruption device such as a shunt trip circuit breaker. Observe the
following requirements when connecting an interruption device:
• Operation: Non-fail-safe, normally open, continuous closed when tripped
•Voltage: 120 VAC, 60 Hz coil
•Current draw: Minimum 1 mA, maximum 5 A
Locate the connections labeled as Number 5 in the diagram in Section 3.1
(Page 7). Refer to the wiring diagram below. Make connections to the bottom
side of the terminal blocks.
CAUTION: Do not connect interruption equipment
that does not meet the requirements listed above. Con-
necting incompatible equipment may result in injury or
equipment damage.
NOTE: Contact Bender if application requirements dif-
fer from those above, or if a separately derived trip
voltage is required.
C
A
U
TI
O
N
S
hu
nt L
1
S
hu
nt
N
C
u
rrent tr
a
ns
.
l
Current trans.
k
Circuit breaker
Shunt trip coil

Installation and Connection
14
MarinaGuard © 2023 Bender Inc. All Rights Reserved
3.6.4 Wiring Block Diagram Reference
MarinaGuard
MG-1.3
Control L1
Control N
Ground
Current trans. l Current trans. k
External current
transformer
LN
120 VAC, 60 Hz
Grounded Supply
Ready /
Test / Reset
Alarm
(Strobe)
External shunt
trip coil
Shunt L1 Shunt N L1 N

Installation and Connection
3. 7 Current Transformer Installation
Install one current transformer on the circuit to be monitored. The current
transformer will detect a ground fault on the load side of its location. Pass all
active conductors of the monitored circuit, including the neutral if present,
through the current transformer opening. Do not pass the ground conductor
through the current transformer.
Ensure that the conductors are placed centrally through the opening. Direc-
tion (polarity) is unimportant. A monitored circuit will consist of two, three, or
four conductors. Refer to figures below.
CAUTION: Do not route the ground conductor
through the current transformer.
NOTE: Only specified Bender current transformers are
compatible. Refer to Section 6. for a list of devices. Third
party current transformers are not supported.
C
A
U
TI
O
N
15MarinaGuard © 2023 Bender Inc. All Rights Reserved

Installation and Connection
3. 8 Field Adjustments
3.8.1 RCM420 Ground-Fault Relay
The MG-1.3 MarinaGuard incorporates a Bender RCM420 series ground-fault
relay. Key settings affecting the performance of the MarinaGuard are listed
below. For additional information on use, refer to the RCM420 user manual.
3.8.2 Main Alarm
The RCM420 has an adjustable trip level range of 10 mA to 10 A (factory set-
ting 30 mA). This value is adjustable to fit application requirements. The main
alarm will activate the strobe light and trip the connected interruption device.
3.8.3 Pre-Trip Alarm
The pre-trip alarm is set as a percentage of the main trip alarm value. For
example, the factory setting is 70% of 30 mA, which equates to 21 mA. The
pre-trip alarm will only activate the RCM420 LED AL1. Connected interruption
devices will not trip and the strobe light will not activate.
3.8.4 Time Delay
The RCM420 has an adjustable trip delay range of 0 to 10 s (factory setting 100
ms). This value is field adjustable for selective coordination of cascaded
devices to minimize the number of de-energized circuits.
3.8.5 Digital Display
The RCM420 has a digital display which shows the measured ground-fault cur-
rent in real-time. The display and pushbuttons are used to adjust factory set-
tings. By default, the RCM420 is password protected with password “001.” No
settings can be changed until this password is entered.
WARNING: Do not change any settings other than
those shown in this chapter. Incorrect settings may
result in death, personal injury, or damage to
equipment.
WARNIN
G
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MarinaGuard © 2023 Bender Inc. All Rights Reserved

Installation and Connection
3.8.6 RCM420 Interface Elements
1Digital display
Shows ground-fault current readings and menu options.
2T / UP button:
Scrolls up inside device main menu.
3R / DOWN button:
Scrolls down inside device main menu.
4
MENU / ENTER button:
Activates main menu / confirms or cancels step inside main
menu.
1
2
3
4
T
R
17MarinaGuard © 2023 Bender Inc. All Rights Reserved

Installation and Connection
3.8.7 Using the Push Buttons
3.8.8 Password Protection
When attempting to change any settings in the main menu, a prompt will
appear to enter a password. Follow the steps below to enter the password. The
factory setting is “1.”
Once the correct password is entered, settings can be changed until leaving
the main menu. Upon re-entering the main menu, the password must be
entered again.
Hold for > 1.5 s
Press and hold the specified button for at least 1.5 seconds.
Release the button when the display changes to the next
menu item.
Press Momentarily press the specified button.
With the display showing the setting to be
changed, press the MENU button. The lock icon will
become solid. Three dashes will flash in the middle
of the screen..
Press the UP and DOWN buttons to enter in the
password (example shown: 470).
Press the MENU button. If the correct password was
entered, the display will return to the previous
menu item and settings will be modifiable until
exiting the main menu.
- - -
Short press
470
T R
Password
Entry
60.0
I 2
>
Short press
18
MarinaGuard © 2023 Bender Inc. All Rights Reserved

Installation and Connection
3.8.9 Change Trip Level
CAUTION: Consult all federal, state/provincial, or local
requirements before adjusting trip levels. Do not set the
trip level above what is allowed by a governing code,
standard, or regulation.
Hold the MENU button for > 1.5 s. A flashing “AL”
will appear on the screen.
Press the MENU button. A number will appear in
the middle of the screen. “I 2” will appear flashing in
the top right corner, and a greater than symbol (>)
will appear flashing on the left side.
Press the MENU button. Password entry will be
required. Afterwards, the “I 2” and greater than
symbol will become solid, and the number in the
middle will flash.
Press the UP and DOWN buttons to change the
pickup level to the desired amount. At a certain
threshold, the value may change to a decimal value
with a “k” to the right. This indicates that the place
of the value has changed and is measured multi-
plied by 1000 (in the example shown, 0.80k is equal
to 800 A).
Once completed, press the MENU button to confirm
the value. The number will become solid, and “I 2”
and the greater than symbol (>) will flash.
Hold the MENU button for > 1.5 s. A flashing “AL”
will appear on the screen.
Hold the MENU button again for > 1.5 s. The device
will exit the menu and return to the normal display.
C
A
U
TI
O
N
Hold > 1.5 sec
60.0
I 2
>
Short press
60.0
I 2
>
Short press
0.80
I 2
>
T R
Pickup level
adjustment
k
0.80
I 2
>
Short press
k
Hold > 1.5 sec
Hold > 1.5 sec
19MarinaGuard © 2023 Bender Inc. All Rights Reserved

Installation and Connection
3.8.10 Change Trip Time Delay
Hold the MENU button for > 1.5 s. A flashing “AL”
will appear on the screen.
Press the DOWN button twice. A flashing “t” will
appear on the screen.
Press the MENU button. A number will appear in
the middle. A flashing “ton” will appear in the lower
left corner, and a flashing “1” will appear in the top
right corner.
Press the DOWN button once. The number “1” in
the top right corner will change to “2.” This is the
time delay for the main pickup alarm.
Press the MENU button. Password entry will be
required. Afterwards, the “2” and “ton” will become
solid, and the number in the middle will flash.
Press the UP and DOWN buttons to adjust the time
delay to the desired value.
Once complete, press the MENU button. The mid-
dle number will become solid, and the “ton” and “2”
will flash.
Hold the MENU button for > 1.5 s. A flashing “t” will
appear on the screen.
Hold the MENU button again for > 1.5 s. The device
will exit the menu and return to the normal display.
Hold > 1.5 sec
t
R
x 2
0.10
1
s
ton
Short press
0.10
2
s
ton
R
0.10
2
s
ton
Short press
0.50
2
s
ton
T R
Delay Adjustment
0.50
2
s
ton
Short press
t
Hold > 1.5 sec
Hold > 1.5 sec
20
MarinaGuard © 2023 Bender Inc. All Rights Reserved