Blue-sea-systems 8410 AC Digital Meter Panel - 240V AC User Manual download pdf

Marine Electrical Prod

ucts

120/240 AC Digital Meter Panel

PN 8410

Panel Speciﬁ cations

Material: 0.125” 5052-H32 Aluminum Alloy

Primary Finish: Chemical Treatment per Mil Spec C-5541C

Final Panel Finish: Graphite color 2 part textured Polyurethane

Inches Millimeters

Overall Dimensions: 5-1/4 x 3-3/4 133.40 x 95.30

Mounting Centers: 4-7/16 x 2-15/16 112.70 x 74.60

Standards: This panel, when properly installed, complies with

all applicable Standards and Recommended

Practices of the American Boat and Yacht Council

as well as United States Coast Guard 33 CFR Sub

Part 1.

Panel Features

• Perfect solution for monitoring 120/240V AC systems

• Monitor Line 1 or Line 2 to Neutral and Line 1 to Line 2 Voltages

• Monitor 120V and 240V currents

• Intended for use with 8247 AC Digital Multimeter (Not included)

• Includes two additional current transformers PN 8256

Blue Sea Systems Inc. Phone (360) 738-8230

425 Sequoia Drive Fax (360) 734-4195

Bellingham, WA 98226 USA E-mail [email protected]

www.bluesea.com

Document 6961 Rev.E

Page 1 of 3

WARNING

@ It is not possible within the scope of these instructions to fully acquaint

the installer with all the knowledge of electrical systems that may be

necessary to correctly install this product. If the installer is not

knowledgeable in electrical systems we strongly recommend that an

electrical professional be retained to make the installation.

@ Do not use this meter panel for systems using two 120V shore cords

and individual load groups in the panel. It is potentially hazardous to

connect the two shore neutrals together on the boat if certain faults

occur in the marina wiring. This panel only has a single neutral

reference connection.

@ If either the panel front or back is to be exposed to water it must be

protected with a waterproof shield.

@ The panels must not be installed in explosive environments such as

gasoline engine rooms or battery compartments as the circuit breakers

are not ignition proof.

@ The vessel’s shore power cord must be disconnected form shoreside

power before installing this electrical panel.

@ If an inverter is installed on the vessel its power leads must be

disconnected at the battery before the panel installation. Be aware that

many inverters have a “sleep mode” in which their voltage potential

may not be detectable with measuring equipment.

@ If an AC Generator is installed aboard it must be stopped and rendered

inoperable before the panel is installed.

@ Verify that no other AC source is connected to the vessel’s wiring

before the panel is installed.

Guarantee

Any Blue Sea Systems product with which a customer is not satisﬁ ed

may be returned for a refund or replacement at any time.

Introduction

The 120/240V AC Digital Meter Panel (PN 8410) is a kit that allows a

single Blue Sea Systems PN 8247 AC Digital Multimeter to completely

monitor a 120/240V AC 60Hz, single phase, three wire system.

The assembly is installed in a standard sized 4-7/16” x 2-15/16” Blue

Sea Systems panel. The 8247 AC Digital Meter (not included) is panel

mounted in a precut hole. The kit also includes the two additional

Current Transformers (PN 8256) that are shown in the installation

drawing.

Understanding Current Flow

in 120/240V AC Single Phase Systems

Before beginning installation please read this section to understand

exactly how the system must be wired. The easiest way is to understand

it one step at a time. We begin by thinking about DC systems.

In a DC circuit we assign a polarity to Voltage and a direction to current

ﬂ ow. By convention current ﬂ ows out of the positive of the source through

the load, where there is a voltage drop, and returns to the negative of the

source. It is easy to visualize the current ﬂ owing out of a battery, through

a light bulb, and back to the battery. There is a voltage rise across the

battery and a drop across the light bulb. If we connect another light bulb,

it too requires current. The total current will be sum of the current ﬂ owing

in each bulb.

When we think about AC current ﬂ ow it is easy to be confused by the fact

that the current ﬂ ow changes direction 60 times a second (or 50 in

Europe). That is why we call it alternating current. Fortunately, if we use

RMS Voltage and Current, we normally use exactly the same laws and

rules for AC and DC. We simply assign a current ﬂ ow direction, voltage

rises and drops, and as long as we stay consistent everything works just

like DC. The major exception is when calculating power for non-resistive

we must take into account power factor, which is beyond the scope of

these instructions.

Current Flow in a 240V Load

First consider the current ﬂ ow in a 240V load, in this example Load 3,

and assume it is purely resistive. The red arrows indicate the direction

we are assigning to the current ﬂ ow from the AC source, which might be

shore power or a generator. We could have reversed the current ﬂ ow

assignment but once a direction is assigned we cannot change it. We

have intentionally not shown the neutral.

Adding a 120V Load

Now let’s add the Neutral and a 120V load that is connected between L2

and Neutral. The current ﬂ ow for this load is shown with green arrows.

The current ﬂ ows through the load and returns back to the source (shore

power or a generator) via the neutral. We see that the current in L2 is

now equal to the current ﬂ owing in the 240V Load 3 plus the 120V

Load1. We also see that the current ﬂ ow in Line 1 is unchanged.

1 2 3

Marine Electrical Prod 1
Page 2 of 3 2

Summary of Contents

Page 1 - Marine Electrical Prod

Marine Electrical Products120/240 AC Digital Meter PanelPN 8410Panel Speciﬁ cationsMaterial: 0.125” 5052-H32 Aluminum AlloyPrimary Finish: Chemical

Page 2 - Page 2 of 3

Current Flows in a 120/240 Single Phase Three Wire System Finally, in this diagram we add another 120V load, Load 2 connected to L1 and Neutral. S

Page 3

Caution The wiring complexity is naturally increased by the addition of two more CT’s and sensing two additional voltages. Be careful not to

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Blue-sea-systems 8410 AC Digital Meter Panel - 240V AC User Manual

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Summary of Contents

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