A profile · Bethesda

Alliance Cabling

Bethesda, MD · Serves a 72-mile radius · Established 2012

✓ ★ 4.9 (124 reviews)

ETHERNET ·POE ·PHONE / VOIP ·AUDIO / VIDEO ·FIRE ALARM

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Illustrative photo for Alliance Cabling, a low-voltage installer in Bethesda, MD — Stock imagery: illustrative of the work Alliance Cabling performs. Real install photography in progress as we feature more pros.

Service area: 72-mile radius around Bethesda, MD — *Serves a 72-mile radius around Bethesda, MD.*

Bethesda's go-to contractor for ethernet & structured cabling and power over ethernet. Alliance Cabling serves residential and commercial clients across Maryland.

Owner-operator Angela Thompson runs the day-to-day at Alliance Cabling, working with the kind of hands-on attention to detail that's gotten the shop 124 verified reviews on WiringInstallers. After 14 years in the trade, the work speaks for itself.

4.9 out of 5 · 124 verified reviews

What they do 5 focused categories of work.

Ethernet & Structured Cabling

Cat5e, Cat6, Cat6A installation and termination for homes and businesses.

Power over Ethernet (PoE)

PoE switch installation, WAP cabling, and powered device networks.

Telephone & VoIP

Phone system cabling, PBX installation, and VoIP infrastructure.

Audio/Video & Home Theater

HDMI, speaker wire, and whole-home AV distribution systems.

Fire Alarm & Life Safety

Fire alarm panel wiring, notification devices, and code-compliant installations.

Trained and certified 3 credentials, current as of last refresh.

BICSI INST1 /BICSI INST2 /OSHA 10

Verified by WiringInstallers · last refreshed June 2026.