MTL Instruments ZoneMaster Operating Manual

CONNECTING LEADS

Connect the suppressor as shown in the installation diagram. Refer
to page 5 for recommended cable dressing. Connect the terminals
within the suppressor to the load side of 60A breakers within the
panel.

RECOMMENDED WIRE GAUGE

Minimum of 8 AWG
Maximum of 4 AWG ( for ease of dressing)

LENGTH OF CONNECTING LEADS

The longer the connecting leads between the the ZoneMaster and
power panel, the higher the residual transient voltage.

RECOMMENDED MAXIMUM: 19” (500mm)
IDEALLY: 10” (250mm)

RECOMMENDED CABLE DRESSING

Each 10” (250mm) increase in cable length; increases clamping volt­age by 25V per 1000A surge current discharged.

• BIND THE PHASE NEUTRAL AND GROUND
CONDUCTORS TIGHTLY, OVER THE ENTIRE RUN
FROM THE SUPPRESSOR TO THE SERVICE PANEL.

• ALWAYS USE THE SHORTEST LENGTH OF
CONNECTING CABLE POSSIBLE.

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DIMENSIONS

INTRODUCTION

60A

N

L2

L1

L1 L2

G

N

This document explains how to install the ZoneMaster Series of AC
Panel Surge Protective Devices.

INSTALLATION INSTRUCTIONS

Warning: T erminals marked L1, L2, L3, N, GND (where relevant) must

be connected respectively to phase(s) neutral and ground. Failure to
comply may result in danger or damage. See corresponding diagrams
for proper connections.

INSTALLATION DESCRIPTION

ZoneMaster units are connected in parallel (or in “shunt” across) the
supply to be protected. The connecting cable does not carry the sup­ply current, only the current associated with suppressing the transient
overvoltage.

MOUNTING

The units should be mounted as close as possible to the panel to be
protected. See (page 4) on Connecting Lead lengths. Conduit, preferably
metallic, is to be installed from the suppressor to the panel. Drill holes
in the ZoneMaster enclosure only in the designated areas as shown in
recommended cable dressing illustrations (page 5). Mount the unit
in the appropriate location using the mounting holes provided on the
enclosure.

ZONEMASTER

Confi guration

and Schematic Connection Diagrams

120/240V SPLIT PHASE 3W

INCORRECT INSTALLATION WILL IMPAIR THE
EFFECTIVENESS OF THE AC PANEL PROTECTORS.

Particularly important is the length of the connecting leads (see
page 4).

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