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Diagram of three cable tray tiers on rods A and B at 300 mm centres, 23.53 kg total, 10.36 kg and 13.17 kg per rod
How To
Jarek Wityk

How to size cable tray

A tray can pass on width and still be wrong. Table 4C1 gives four different grouping factors for four different arrangements of the same six circuits; the fault force on the cleats is set by the current at the tray and its peak factor, not the device rating; and every run on a multi-service bracket lands on the same two rods. The four checks to BS 7671:2018+A4:2026, BS EN 61914 and BS 8519:2020, worked.

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2026-08-12 No Comments
Automatic transfer switch panel with double line bypass, a two door enclosure with rotary switches and a controller
How To
Jarek Wityk

ATS

Automatic Transfer Switch (ATS) In a Higher-Risk or life-safety building, the firefighting and smoke-control plant is only as resilient as the device that switches it onto standby power. The automatic

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2026-06-19 No Comments
Graphic headed Domestic PV sizing rule-of-thumb, RoT, with solar panel, thumbs up, battery and inverter icons
How To
Jarek Wityk

Domestic PV sizing rule-of-thumb (RoT)

Domestic PV sizing rule-of-thumb (RoT) Grid-tied, focused on self-consumption UK rule-of-thumb (RoT) Peak Sun Hours (PSH): 3.5 summer, 2.0 spring/autumn, 1.0 winter For calc use Peak Sun Hours (PSH) =

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2025-09-25 No Comments
mimic panel
How To
Jarek Wityk

Mimic Panels for Life-Safety Generators

Mimic Panels for Life-Safety Generators – UK-Specific Designer’s Guide Key takeaway: Indicator for generators and smoke-control systems (commonly referred to as ‘mimic panel’, often marked “ESP – Emergency Stand-by Power

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2025-07-19 No Comments
Flowchart choosing the earthing system: TN-C-S PME, TN-C-S variant PNB, TN-S and TT, each with a typical Ze value
How To
Jarek Wityk

UK Earthing & Bonding Design Reference

UK Earthing & Bonding Design Reference (Edition 2025 – aligned with BS 7671:2018+A2:2022, Amendment 3 (2024), and draft Amendment 4 (2026), also drawing from official UK Power Networks standards) Scope,

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2025-07-11 2 Comments
CPR cable Euroclass classification
How To
Jarek Wityk

CPR Cable Classification Guide

Since July 2017, all power, control and communication cables permanently installed in buildings must comply with the Construction Products Regulation (CPR).
This guide is your reference for navigating Euroclass ratings, selecting compliant products.

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2025-06-04 No Comments
Step 3 installation drawing of the ARR906U AFDD being fitted beside a circuit breaker on a DIN rail and busbar
How To
Jarek Wityk

Arc Fault Detection Devices (AFDDs) 

Arc Fault Detection Devices (AFDDs) in the UK: Technical Requirements and Implementation Executive Summary Arc Fault Detection Devices (AFDDs) represent a significant advancement in electrical fire safety. This whitepaper provides

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2025-05-23 No Comments
Cross-sectional view of a residential building’s fire core, showing protected stairwells, lift shafts, fire-rated partitions, and service risers enclosed within fire-resistant construction, designed to maintain vertical compartmentation and safe evacuation routes during a fire.
How To
Jarek Wityk

Secondary Supply – diverse cable route

This guidance covers the routing of secondary supply cables from a life safety generator to the ATS (Automatic Transfer Switch), and the final equipment with reference to:

BS 7671:2018+A2:2022, specifically Section 560: Safety Services

BS 8519:2020, with emphasis on Clause 7 (Cable Routing) and Clause 11 (Cable Selection)

The goal: clarify requirements for the diverse cable routing and maintain circuit integrity under fire conditions for systems that support life safety and fire-fighting applications, such as sprinkler pumps, fire-fighting lifts, and smoke control systems.

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2025-05-05 No Comments
electric vehicle charging point
How To
Jarek Wityk

Electric Vehicle Charging Points

Active charging points are fully wired and connected, ready-to-use charging points.
A passive charging point, on the other hand, is the infrastructure without the final charging unit installed.

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2025-04-09 No Comments
HVO fuel
How To
Jarek Wityk

HVO Fuel

Hydrotreated Vegetable Oil (HVO) is a renewable, diesel-type fuel made from vegetable oils and fats instead of crude oil​.

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2025-04-02 No Comments
Life safety generator installed for emergency power backup in a residential building, ensuring uninterrupted operation of critical systems during outages
How To
Jarek Wityk

Life Safety Generator

Life Safety Generator selection guide Copy If the secondary power supply is provided for firefighter’s lift, it must be capable of operating the firefighter’s lift at its full rated load

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2025-02-27 No Comments
The problem-solving process: slide 1 from the Project Design ELI5 BIM in Practice explainer
How To
Jarek Wityk

Problem Solving Process

Understanding the Problem-Solving Process

Effective problem-solving is at the heart of success in any field. Drawing inspiration from the book “General Relativity for Babies” by Chris Ferrie, which simplifies complex topics into easy-to-understand concepts, I have created a straightforward guide to the problem-solving process.

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2024-07-14 2 Comments
Six-step guide How to: Force Relinquish, from Manage Cloud Models in Revit to the Force Relinquish dialog
How To
Jarek Wityk

Force Relinquish

Tip of the Day (TOD): How to Relinquish Locked Revit Models If you’ve ever been frustrated by locked Revit model elements when a team member is unavailable to relinquish them,

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2024-07-14 No Comments
COBie Extension Setup Systems page with system name fields and the Uniclass Table Ss category
How To
Jarek Wityk

COBie data drop

COBie data drop Individual COBie data drops are the responsibility of Task Team BIM Managers, who must upload the required information containers in accordance with Exchange Information Requirements (EIR).The COBie

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2022-10-15 No Comments
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