Medc XB11 Manuel d'utilisateur télécharger pdf (Page 3)

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1.0 INTRODUCTION

These certiﬁed beacons have been designed for use in potentially explosive gas and dust atmospheres and harsh environ-

mental conditions. The glass reinforced polyester enclosures are suitable for use offshore or onshore, where light weight

combined with corrosion resistance is required.

The beacon housing is manufactured completely from a U.V. stable, glass reinforced polyester. Stainless steel screws and

mounting bracket are incorporated ensuring a totally corrosion free product.

Units can be painted to customer speciﬁcation and supplied with indentiﬁcation labels.

2.0 INSTALLATION

General

When installing and operating explosion-protected equipment, requirements for selection, installation and operation should

be referred to eg. IEE Wiring Regulations and the ‘National Electrical Code’ in North America. Additional national and/

or local requirements may apply.

Ensure that all nuts, bolts and ﬁxings are secure.

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

The unit can either be directly mounted using the inserts moulded into the back of the enclosure (standard), or a back-

strap (optional) can be ﬁxed to the base of the unit thus giving an optional mounting position for when direct mounting

is deemed unsuitable.

There are 2 off M5 inserts in the base of the enclosure for direct mounting.

Please note: for direct mounting, observe the following formula to determine length of ﬁxing screw required:-

Length of screw = Thickness of mounting surface + 10mm

There are 2 off Ø8.5mm mounting holes in the optional backstrap. These have been designed to accept an M8 screw

or bolt

MEDC recommend the use of stainless steel screws.

Cable Termination

CAUTION: Before removing the cover assembly, ensure that the power to the unit is isolated.

Unscrew and remove the 6 off M5 screws (4.0mm hexagon key) holding the cover assembly to the base. Keep in a safe,

accessible location as they are non-captive.

Twist the cover assembly gently clockwise and anti-clockwise, whilst pulling it away from the base. Remove to gain access

to the interior.

Cable termination should be in accordance with speciﬁcations applying to the required application. MEDC recommends

that all cables and cores should be correctly identiﬁed. Please refer to the wiring diagram provided with the product.

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

earthed.

All cable glands should be of an equivalent NEMA/IP rating to that of the unit and integrated with the unit such that this

rating is maintained.

The internal earth terminal, where ﬁtted, must be used for the equipment grounding connection.

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

surfaces. Replace the 6 off M5 screws (4.0mm A/F hexagon key) into the holes in the cover assembly and tighten evenly.

Ensure the O-ring is seated correctly on the cover during re-assembly. Ensure the required maximum gap of 0.2mm is

maintained between the cover and the base once assembled.

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Medc XB11 Manuel d'utilisateur Page 3

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