Energy performance of buildings - Method for calculation of system energy requirements and system efficiencies - Part 4-1: Space heating and DHW generation systems, combustion systems (boilers, biomass), Module M3-8-1, M8-8-1
Edition 2017

Signalling on low-voltage electrical installations in the frequency range 3 kHz to 148,5 kHz Part 4-1: Low voltage decoupling filters - Generic specification
Edition 2023-03

Signalling on low-voltage electrical installations in the frequency range 3 kHz to 148.5 kHz. Part 4-1: Low-voltage decoupling filters - Generic specification
Edition 2001-07

Home and building electronic systems (HBES). Part 4-1: Media independent layers - Application layer for HBES class 1
Edition 2004-02

Multi-element metallic cables used in analogue and digital communication and control - Part 4-1: Sectional specification for screened cables characterised up to 600 MHz - Horizontal and building backbone cables
Edition 2013-05

Communication cables - Specifications for test methods. Part 4-1: Environmental test methods - General requirements
Edition 2001-10

Communication cables - Part 4-1: General considerations for the use of cables - Environmental conditions and safety aspects
Edition 2014-12

Insulating, sheathing and covering materials for low voltage energy cables. Part 4-1: PVC sheathing compounds
Edition 2005-11

Fibre management systems and protective housings to be used in optical fibre communication systems - Product specifications - Part 4-1: Passive optical street cabinet for category A
Edition 2019-07

Information technology - Data centre facilities and infrastructures - Part 4-1: Overview of and general requirements for key performance indicators
Edition 2016-12