# Electrical Design

• ## What is Sag in Overhead Power Transmission Lines?

Calculation of Sag in Overhead Transmission Lines What is Sag? Sag in overhead power transmission line refers to the natural, downward curvature or dip that occurs in the power lines…

• ## Why is the Ground Wire Always Positioned Above the Overhead Power Lines?

Why is the Ground Wire Above the Phase Lines in the Overhead Transmission Line? The ground wire (also known as earth wire or OPGW) above the phase lines in overhead…

• ## How Many Poles and Towers are Situated Within a 1-km Span?

How Many Utility Poles and Transmission Towers are Located Within a 1-kilometer Distance? The number of electricity poles for distribution and towers for power transmission in a 1-kilometer distance can…

• ## Why are Overhead Power Transmission Lines Not Insulated?

Why Use Bare Conductors for Overhead Transmission Lines Instead of Insulated Conductors? You may have noticed that we use insulated cables for underground power transmission, as well as in industrial…

• ## How to Wire Twin Timer for Repeated ON-Delay in Cycle Mode?

Wiring Digital Twin Timer in Repeated ON Delay Cycle Mode In our previous wiring tutorial, we discussed how to wire a one-shot timer using a twin timer for delay. In…

• ## Wire Twin Timer in Repeat Cycle & One-Shot Mode for 120V/240V Motors?

How to Wire Twin Timer in Repeat Cycle and One-Shot Mode for 120V/240V Motors? A digital twin timer can be wired and configured for repeat cycle (ON-delay or OFF-delay) and…

• ## How to Wire Twin Timer for 120V/240V Circuits – ON/OFF Delay

Wiring Digital Twin Timer for ON/OFF Delay Operations in 120 and 240V Circuits As the name suggests, a digital twin timer performs dual operations in a single circuit. It can…

• ## How to Wire Multifunction ON/OFF Delay Timer for 120V/240V Motors?

How to Control 120V/240V Motor using Multifunction ON-OFF Delay Timer? In today’s step-by-step wiring tutorial, we will learn how to wire an OFF-delay and ON-delay timer for 120V and 240V…

• ## How to Wire One-Shot Timer using Twin Timer For Delay?

Wiring Twin Timer for One-Shot Operation of Recirculation Pump What is a One-Shot Timer? As the name suggests, it performs a single operation per signal activation instead of repeated cycle…

• ## How to Control 120V & 240V Water Heater using ST01 Timer and Contactors?

How to Wire ST01 Timer with Relay & Contactor for 120V/240V Water Heater? In today’s wiring tutorial, we will demonstrate how to wire and control a 120V and 240V water…