How to install a manual transfer switch for a backup system in 16 steps

A manual transfer switch is installed next to the main service panel to override the normal electrical service with power from a backup generator during a power outage. Manual transfer… Read more

Aug 02, 2017 | Edvard

20 Simple Questions to Check Your Overcurrent Protection Knowledge

As you already know, reliable overcurrent protective devices, such as fuses and circuit breakers, prevent or minimize costly damage to transformers, conductors, motors, equipment, and the other many components and… Read more

Jul 31, 2017 | Edvard

Unbalance protection of grounded & ungrounded wye shunt capacitor banks

The protection of shunt capacitor banks against internal faults involves several protective devices in a coordinated scheme. Typically, the protective elements found in a shunt capacitor banks (SCB) for internal… Read more

Jul 26, 2017 | Edvard

What does bonding (bonded) mean and what does NEC article 250 say about it?

The National Electrical Code (NEC) covers grounding and bonding in several articles, but the primary coverage is in Article 250. Typical commercial electrical systems are grounded systems. Within the system,… Read more

Jul 21, 2017 | Edvard

11-step procedure for a successful electrical circuit design (LV project example)

Let’s take an example of electrical circuit design. A consumer lives in a bungalow with a detached garage and workshop, as shown in Figure 1. The building method is traditional… Read more

Jul 19, 2017 | Edvard

Practical solutions for preventing ferroresonance in electrical installations

Ferroresonance is a non-linear resonance phenomenon that can affect power networks. The abnormal rates of harmonics and transient or steady state overvoltages and overcurrents that it causes are often dangerous… Read more

Jul 17, 2017 | Edvard

How choice of system earthing affects low voltage switchgear?

Choice of system earthing affects not only dependability (in the largest sense) but also installation, in particular with respect to the low voltage switchgear to be implemented. The three system… Read more

Jul 05, 2017 | Edvard

Power quality monitoring with line disturbance analyzers and voltage recorders

Many power quality problems are caused by inadequate wiring or improper grounding. These problems can be detected by simple examination of the wiring and grounding systems. Another large population of… Read more

Jul 03, 2017 | Edvard

System earthings and incidents on MV side that result in LV disturbances

Low voltage networks, unless a replacement uninterruptible power supply (with galvanic insulation) or a LV/LV transformer is used, are influenced by MV. This influence takes the form of: capacitive coupling, galvanic… Read more

Jun 30, 2017 | Edvard

2 types of synchronisers required on a power system with two supplies

Synchronisers are required at points on a power system where two supplies (either generator and grid, or two grid supplies) may need to be paralleled. They are more than just… Read more

Jun 26, 2017 | Edvard