Page 51 - 2017 Product Guide

CONTROLS & ACCESSORIES | ELECTRICAL INFORMATION

What is a contactor/snubber?
A contactor/snubber is designed to switch
FROM FUSED SUPPLY L N E loads greater than 16A on one thermostat.
N The snubber must be connected to the circuit
THERMONET MAT
EARTH SCREEN as shown, to absorb any electrical surges that
ENSURE THAT ALL SUB
CIRCUITS ARE FUSED could disrupt the memory of the thermostat.
DOWN FOR ADEQUATE
PROTECTION
HEATING CIRCUIT Do I need a contactor/snubber?
L
1 A1 Thermogroup thermostats are designed to
THERMOSTAT
LOAD LIVE handle a total load of up to 16A. If your
CONTACTOR
SUPPLY NEUTRAL SNUBBER system exceeds this total load you will need a
SUPPLY LIVE suitably rated contactor/snubber to ensure a
2 A2 MULTIPLE MATS MUST safe and functional electrical circuit. Ask our
BE INDIVIDUALLY FUSED sales team for details.
IN ACCORDANCE WITH
CURRENT REGULATIONS A 16A thermostat can control:
Up to 24m of 150W/m EUFH (3600W)
2
2
EARTH
Up to 18m of 200W/m EUFH (3600W)
2
2
See contactor options on Pg. 49
IP Ratings & Zones
Zone 0
Inside bath or shower. Any fitting used in
this zone must be low voltage (max 12V)
and a rating of at least IPX7 is required.
Transformers and switches must be outside
zones 0 & 1.

Zone 1
Area above the bath to height of 2.25m
from the floor and 1.25m from the water
outlet. A minimum rating of IPX4 needed.
Appliance must be protected by a 30mA
RCD protected circuit.

Zone 2
Covers 0.6m outside the perimeter of the
bath to a height of 2.25m from the floor.
Also covers a radius of 60cm around a
wash basin. Minimum rating of IPX4.

Outside Zones
(Diagram for illustrative purposes only) No specific requirements unless water
jets are intended for cleaning purposes, in
IP Ratings which case a minimum of IPX5 is required.
Electrical fixtures in bathrooms are certified using an IP (Ingress Protection) rating. The IP
is followed by 2 numbers referring to the level of protection against the ingress of foreign All Zones
bodies (1st number) and protection against the ingress of liquids (2nd number). All electrical circuits in bathrooms must
be protected by a suitably rated RCD. If
Zonal Guidelines exposed to water jets such as a shower, a
All domestic installations must comply with guidelines based on the zonal requirements. rating of at least IPX5 is required.
Thermogroup recommend that all electrical work is carried out by a qualified
electrician in accordance with all current and relevant building regulations.

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