Alpha LI424B Specsheet

LI424B Flashing Strobe for Hearing Impaired

Product Specification Sheet

APS1081

Rev. 07 /20 17

AR C HIT EC T S' AND ENG INEER S'

SPECIFIC AT IO NS

The strobe light unit(s) shall be Alpha
Communications ® LI424B or approved equal. Operation

shall be accomplished by placing a call to an apartment
int e rc om (or video-intercom) st ation. The st robe shall
flash for approximately 20-35 seconds after activation of
the incoming call signal.

The strobe light shall have a brightness of 15 candela
p e r UL® 1971 (75 candela per UL® 1638). It shall be

encased in an at tractive, flame retardant type ABS plastic
housing.

The strobe light shall meet ADA and UL®
requirements for signaling appliances. The st robe shall be

powered by the appropriate 24VDC power source (IA543,

PK601A or equivalent). Current draw shall be 120mA.

Contractor shall observe all local and national
electrical and building codes.

FEAT URES

Easy to install and operate
Low-power operation
Multiple applications

Built-in timer circuitry
Hi-brightness strobe

Precision engineering

LI424B FLASHING ST RO BE FO R HEAR ING

IMP AIRED

The Alpha Communications® LI424B strobe is a high­intensity remote visual signaling device which is
typically used with the Alpha Communications® IA543
amplifier apartment intercom systems, and optionally
with the Alpha Communications® IA502 multi-entrance
transfer relay(s).

Due to its versatility, the LI424B can also be used as a
stand-alone device, which can be triggered by a dry
contact pushbutton or dry contact relay closure.

The unit is primarily for use in locations where hearing­impaired persons require supplemental call notification, but
can be used anywhere t hat a visual indication of an
incoming call is desired. The bright strobe light flashes
once a second for approximately 20-35 seconds when an
incoming c all is det ec ted (depending on amperage of the
24VDC power supply).

The device can be installed onto a st andard 4-inch square
elect rical box or similar indoor openings. It is not a
weatherproof device and therefore should not be used for
any outdoor applicat ions. Installation is facilit ated by use
of simple c onnec tions to the pre-mounted circuitry and a
complement of mounting hardware.

REQUIRED C O MPONENT S

LI424B Strobe Unit

System Amplifier: may be used with IA543
a n d related system c omponents (IA502 t ransfer
relay(s), IS and IR apt. st ations, AM & VI series or
similar entrance panels).

PK601A Power Supply (requires SS106 transformer

for power). One (1) per system when used with
apartment amplifier(s) shown above, or one (1) per
unit when used as stand-alone st robe(s), or other
equivalent 24VDC power supply.

SPECIFIC AT IO NS

Dimensions:

Height: 5.50" (140mm)
Width: 5.125" (131mm)
Depth (inside wall): 1.50" (39mm)
Projects: 2.125" (54mm) from mounting
surface

Construction:

Attractive flame retardant type ABS
plastic casing

Strobe:

1 5 c a n d e l a per UL® 1971, 75

candela per UL® 1638

Power: 24 VDC, 120 mA

Wiring: 18 ga. minimum, 750' maximum

Mounting:

Standard 4-inch square electrical
box

Alpha Communications

42 Central Drive • Farmingdale • NY • 11735-1202 • Phone: [phone] • Fax: [phone]

TOLL-FREE: [phone] • Web: www.alphacommunications.com • Email: [e-mail]

C opyright© 1998-2018 Alpha C om munica tions - All Rig hts R eser ve d.

Due to continuous product improv ement, all co lors, s ize s, m ateria ls, finishes and s pecifications a re subje ct to cha nge without notice .

®