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Category: Electrium Sales Residual Current Devices Specifications

Electrium Sales Residual Current Devices Specifications    Email Electrium - Crabtree

Technical Data Specification

Technical RCB Data Specification

Applications

RCBOs provide both earth fault and overcurrent protection. For commercial and industrial applications a unit should be employed, utilising Type C (5–10In) classification of MCB. RCBOs, other MCB classifications available to order.

Polestar and 2 module Loadstar RCBOs employ an electromechanical operating principle. Loadstar 1 module RCBOs employ an electronic operating principleincorporating loss of supply neutral protection via a functional earth lead.

All RCBOs give a high level of protection to individual circuits whilst exhibiting improved immunity to response caused by transients. Two module switched neutral RCBO’s have safety advantages over single module RCBO’s and are exclusively used in continental europe.

Advantages of Switched Neutral RCBOs

If a neutral to earth fault occurs in a circuit fed via an RCBO with a solid neutral which is backed up by an upstream selective RCD, the selectivity or discrimination will be lost and the main RCD will also trip as it will still detect the fault which has not been cleared.

The main requirements of RCD protection are:

  • Additional protection against direct contact with live parts

  • Protection against direct connection with live parts

  • Protection against fire in the case of a fault to earth

If a fault occurs between neutral and earth where a solid neutral RCBO is protecting a circuit, the RCBO will trip. However, as previously stated, the fault will still be in the circuit within the rest of the installation.

As the neutral will be common throughout the installation, it is possible that current could still flow through the fault and lead to a fire hazard. This would mean that the RCBO would not offer full protection against fire and therefore does not comply with one of it’s main protection requirements.

Testing of outgoing circuits is easier with RCBO’s incorporating a switched neutral as an electrician does not have to disconnect terminals before testing.

BS7671 requires that the main switch to a TT earthed installation must have a switched neutral.

Installation Testing – Caution

As Single Module RCBOs employ electronic components they should be disconnected when carrying out the following tests on the electrical installation:

(a) Earth fault loop impedance test

The load terminals should be disconnected if it is intended to parallel-out the unit for test purposes.

It may incur damage if mains potential is maintained on the load terminals of this unit after the trip mechanism has operated.

(b) Insulation test

Whilst RCBOs can withstand the effects of normal insulation testers without damage, false readings may be given on the test instrument. For this reason it is recommended that the device is disconnected during this test.

IEC Publication 60479 Curves with Crabtree RCD Characteristics Superimposed

Time/Current Zones of Effects of AC Current (15–100Hz) on Persons

Time/Current Zones of Effects of AC Current (15–100Hz) on Persons

Zone Physiological Effects

1. Usually no reaction effects.

2. Usually no harmful physiological effects.

3. Usually no organic damage to be expected.
Likelihood of muscular contraction and difficulty of breathing, reversible disturbances of formation and conduction of impulses in the heart, and transient cardiac arrest without ventricular fibrillation increases with current magnitude and time.

4. In addition to the effects of zone 3, probability of ventricular fibrillation increased up to 5% (Curve C2) up to 50%
(Curve C3) and above 50% beyond Curve C3. Increasing with magnitude and time, pathyphysio-logical effects such as cardiac arrest, breathing arrest and heavy burns may occur.

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Electrium Sales Residual Current Devices Specifications

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Electrium Sales Ltd
Commercial Centre
Lakeside Plaza Walkmill Lane
Bridgtown
Cannock
WS11 0XE

Tel: 01543 455030
Fax: 01543 438311

 

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