wheelock DB1P UL INSTALLATION INSTRUCTIONS
Technical Manual for the
Horn – DB1P UL
DB1HP UL
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 2003 06/01
1. INTRODUCTION
These horn 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 unit is mounted via 2 x Ø 0.31” (8 mm) fixing holes in the base. The fixing
holes have been designed to accept an M6 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 4 off screws holding the cover assembly to the base.
Keep in a safe, accessible location.
Twist the cover gently clockwise and anti-clockwise, whilst pulling it away from the
unit. 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 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 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 back onto the unit, avoiding damage to the mating surfaces. Replace & tighten the 4 off cover screws
evenly, to ensure maintenance of the required gap between the cover and enclosure.
06/01 © MEDC 2003
GENERAL ARRANGEMENT
" / 140mm FIXING CRS
2
/
1
5
" / 79mm
8
/
1
3
2 - HOLES 5/16" / 8mm DIA
1
/2" / 140mm FIXING CRS
5
1
/8" / 79mm
3
7
6
/8" / 175mm DIA
6 3/4" / 171mm DIA
") / 168mm (216mm)
2
/
1
" (8
8
/
5
6
" (6") / 105mm (152mm)
/
8
3
/
"
1
1
4
30mm
16
ALL DIMENSIONS IN INCHES AND MILLIMETERS
© MEDC 2003 06/01
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