wheelock XB11 INSTALLATION INSTRUCTIONS

Technical Manual for the

Strobe – XB11

Please note that every care has been taken to ensure the accuracy of our
technical manual. We do not, however, accept responsibility for damage,
loss or expense resulting from any error or omission. We reserve the right
to make alterations in line with technical advances and industry standards.

© MEDC 2001 06/01

1. INTRODUCTION

These strobe units have been designed for use in harsh environmental conditions.

2. INSTALLATION
General

When installing and operating explosion-protected electrical equipment, require­ments for selection, installation and operation should be referred to eg. IEC
60079-14 worldwide 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 UL listed stopping plugs are used to blank off unused

gland entry points and that the NEMA/IP rating of the unit is maintained.
The strobe is mounted via 2 x Ø 0.335" (Ø 8.5mm) fixing holes in the backstrap.
The fixing holes 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 screws holding the cover assembly to the base.
Keep in a safe, accessible location.

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

Cable termination should be in accordance with specifications applying to the
application. MEDC recommend that all cables and cores should be fully identified.

Ensure that only correct UL Listed 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 strobe
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 and the external terminal is for a supplementary bonding connec­tion where local codes or authorities permit or require such a connection.

Once termination is complete, carefully push the cover assembly back onto the
base, avoiding damage to the mating surfaces. Replace the 6 off screws into the

holes in the cover assembly and tighten evenly, to ensure maintenance of the
required gap between the cover and base.

06/01 © MEDC 2001

3. OPERATION

The unit is initiated directly from the power source.

GENERAL ARRANGEMENT .

11/2"

38mm

ALL DIMENSIONS IN INCHES AND MILLIMETERS

11/2"

38mm

Ø 5/16"

8mm

11/2"

38mm

77/8"

200mm

11/2"

38mm

2 OFF M5 x 3/8" / 9.5mm DEEP

611/16"

170mm

15/16" / 33mm

Ø 51/4"
133mm

3

/16" / 5mm

4. MAINTENANCE

53/8"

137mm

615/16"

176mm

73/4"

197mm

13

/16"

20mm

Ø 69/16"

Ø 167mm

During the working life of the strobe, little or no maintenance is required. How­ever, if abnormal or unusual environmental conditions occur due to plant damage
or accident etc., then visual inspection is recommended.

If a fault should occur, it is recommended that the unit be returned to MEDC for
repair. All parts are replaceable.

If you have acquired a significant quantity of units, it is recommended that spares
are also made available. Please discuss your requirements with the Technical
Sales Engineers at MEDC.

5. CERTIFICATION/APPROVALS

Please refer to marking on the unit for specific approval details

• UL listed for use in Class 1, Div. 2, Groups C & D
USA (USL) and Class 1, Zone 1, AExd IIB T5
Canada (CNL)

• UL standards UL 2279 & UL 1638

© MEDC 2001 06/01

6. CERTIFIED TEMPERATURE

–55°C to +55°C
–67°F to +131°F

MEDC Ltd, Colliery Road, Pinxton, Nottingham NG16 6JF, UK.
Tel: [phone] Fax: [phone]
Sales Enq. Fax: [phone] Sales Orders Fax: [phone] MEDC Stock No.
E-mail: [e-mail] Web: www.medc.com TM112-ISSA