Subject to Simultaneous Overload
Revit Guides
Data Management
Where circuits are grouped, there are two availablemethods of calculating the rating factor Cg to be applied:
- Subject to simultaneousoverload:Assumes that more than one of the grouped circuitsmay be overloaded at any one time –applies grouping using: In/Cg.
[BS7671:2018,Appendix 4,5.1.2:Equation 2]
- Not subject to simultaneousoverload:Assumes that only one of the grouped circuits will normally be overloaded at any one time (a reasonable assumption for general distribution loads) – uses two calculations to determine Cg from which the highest calculated value is to be used. Usually gives a reduced level of derating compared to ‘Subject to simultaneous overload’.
[BS7671:2018,Appendix 4,5.1.2:Equation 3,4]
Project Information Standards
Project Information standards shall be covered within the BIM Execution
Emergency Lighting in Toilet Cubicles
Summary
1. If the toilet has borrowed light and is less than 8m square:
a. There is no need for emergency lighting, however,
b. If there is a cubicle with full height door – therefore closed without borrowed lighting – then the EM lighting would be required in that cubicle.
2. If the overall toilet has no borrowed light,
a. And the WC cubicles do not have full-size doors; there should be at least one emergency outside row of cubicles.
b. If there is a cubicle with full height door – therefore closed without borrowed lighting – then the EM lighting would be required in that cubicle.
