MEDC PH1 User Manual

Page 3

08/13

1.0 INTRODUCTION

These manual alarm pull stations have been designed for use in hazardous locations and harsh environmental

conditions. The GRP enclosures are suitable for use offshore or onshore where light weight combined with a high

level of corrosion resistance is required

2.0 GENERAL SAFETY MESSAGES AND WARNINGS

All instructions and safety messages in this manual must be followed to allow safe installation of the device. The

device must only be installed and maintained by correctly trained site personnel/installers.

To reduce the risk of ignition of hazardous atmospheres and shock, do not apply power to the device until

installation has been completed and the device is fully sealed and secured.

ii.

To reduce the risk of ignition of hazardous atmospheres and shock, keep device tightly closed when the

circuit is energised.

iii.

Before removing the cover for installation or maintenance, ensure that the power to the device is isolated.

iv.

Following installation, test the device to ensure correct operation.

Following installation ensure a copy of this manual is made available to all operating personnel

vi.

When installing the device, requirements for selection, installation and operation should be referred to

e.g. IEE Wiring Regulations and the ‘National Electrical Code’ in North America. Additional national

and/or local requirements may also apply.

vii.

Cable termination should be in accordance with specification applying to the required application.

MEDC recommends that all cables and cores should be correctly identified. Please refer to the wiring

diagram in this manual (or separate diagram provided with the unit).

viii.

Ensure that only the correct listed or certified cable glands are used and that the assembly is shrouded

and correctly earthed.

ix.

Ensure that only the correct listed or certified stopping plugs are used to blank off unused gland entry

points and that the NEMA/IP rating of the unit is maintained.

MEDC recommend the use of a sealing compound such as HYLOMAR PL32 on the threads of all glands

and stopping plugs in order to maintain the IP rating of the unit.

xi.

The internal earth terminal, where fitted, must be used for the equipment grounding and the external

terminal, if available, is for a supplementary bonding connection where local codes or authorities permit

or require such a connection.

xii.

When installing the device, MEDC recommends the use of stainless steel fasteners. Ensure that all nuts,

bolts and fixings are secure.

xiii.

Blanking plugs are not to be used with the cable entries.

xiv.

When fitting or removing cable entry glands, the cable entry inserts must be held with a suitable tool to

prevent movement.

xv.

To support the requirements of UL38 Clause 6.1.2, when multiple call points are installed in a single
zone the two 18AWG wires required for each of the common incoming and outgoing terminals must be
crimped together in a single boot lace ferrule.

xvi.

Units supplied in any colour other than red are for ancillary use only and shall not be used for fire
alarm use

3.0 INSTALLATION

The pull station is mounted via the 4 off Ø 6.5mm (Ø 1/4”) fixing holes in the base of the enclosure. The unit has

been designed and certified to operate at any attitude

The fixing holes have been designed to accept an M6 screw or bolt.

Cable Termination

Unscrew the 4 off M6 screws (5.0mm A/F hexagon key) holding the cover assembly to the base. The cover screws

are retained in the cover assembly for ease of installation. Gently lift the cover assembly away from the base of

the enclosure to gain access to the interior.

Once termination is complete, carefully lower the cover assembly back onto the base, avoiding damage to the

mating surfaces. Ensure the o-ring is correctly seated in its groove during re-assembly. Evenly tighten the 4 off

cover screws (5.0mm A/F hexagon key). The required torque on each explosion-proof enclosure cover screw
shall not be less than 40 in-lbs (4.5Nm)

. Ensure the required gap (0.038mm / 0.0015” Max.) is maintained

between the cover and the base.