Electrical Systems

Power distribution is about the relationship between feeders, switchboards, protective devices and the equipment they serve. Poor panel access or an ill-defined connection point can create lasting problems when a facility needs to isolate a fault or add new loads.

For industrial and commercial facilities, BILOCO reviews electrical drawings together with equipment locations, cable routes and maintenance clearances before installation. The approved design and operating requirements determine the actual contract scope.

What the electrical scope can include

Depending on the agreed scope, works may include incoming feeders, distribution boards, power cabling, lighting and connections to production equipment. Each package needs clearly defined connection points and interface responsibilities.

Industrial installations also require attention to machine operating patterns, accessible maintenance areas and possible future changes. Equipment selection should reflect real operating conditions, not nameplate ratings alone.

• Main and sub-distribution boards and specified control panels
• Power cables, cable trays, ladders and conduits
• Lighting, socket outlets and equipment power supplies
• Earthing, bonding and lightning protection where included

Design and coordination checks before installation

Work starts with a review of load schedules, equipment positions, single-line diagrams, cable sizing and installation routes against actual site conditions. Intersections with pipework, ductwork and structural members are better resolved before materials arrive.

Operating current, voltage drop, short-circuit withstand and protection coordination require appropriate engineering review or approval. Site changes should be recorded and agreed rather than improvised during installation.

Installation details that matter on site

Cable supports need appropriate spacing and alignment. Cables should be identified at both ends, secured and protected at bends and entry points. Panel placement must allow access, door clearance, ventilation and safe work areas.

Penetrations through floors and walls, and routes near process equipment, require coordination for mechanical protection, fire stopping and inspection access as specified. These details have a significant effect on future maintenance.

Testing before energisation

Commissioning is not simply checking whether the lights come on. Depending on the system, tests can cover circuit identification, terminations, protective conductor continuity, insulation resistance and protective device operation.

Energisation and functional tests need a controlled safety procedure and documented results. Outstanding defects should be corrected and rechecked before handover.

Handover and future changes

As-built drawings, panel schedules, equipment lists and test records show the operations team how power is distributed through the facility. Spare ways and future capacity should be documented against approved design limits.

Keeping circuit labels, drawings and change records current makes later equipment additions and fault isolation more manageable.

What to share for an electrical review

Useful starting documents are the single-line diagram, load schedule, panel layouts and equipment list. Refurbishment enquiries should also include photos of existing switchboards, permitted outage periods and circuits that must remain available.

• Identify supply characteristics, connected loads and possible additions.
• Mark distribution board locations, proposed cable paths and machinery interfaces.
• State any continuous-operation requirements so isolation can be planned safely.

This information provides a practical basis for defining the electrical installation and test scope.